{"product_id":"the-blank-key-t5577-em4305-125khz-rewritable-fobs","title":"The Blank Key | 50-Piece T5577\/EM4305 125kHz Rewritable Fob Set","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp style=\"font-size:16px;line-height:1.8;color:#2d2d2d;margin-bottom:16px;\"\u003eAccess control lives on low frequency cards that nobody thinks about until one fails. The fob on the keyring stops reading, the property manager needs twenty spares before Friday, and the original supplier wants six weeks and a minimum order. A box of blank rewritable fobs in the van turns that problem into a ten minute job.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;line-height:1.8;color:#2d2d2d;margin-bottom:16px;\"\u003eThese fobs run T5577 and EM4305 chips, both of which are rewritable at 125kHz. That combination covers most legacy proximity systems: hotel door locks, gym turnstiles, apartment building readers, time clocks and the older parking barriers still running EM4100 compatible protocols. A standard 125kHz writer clones an existing credential onto a blank in seconds.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;line-height:1.8;color:#2d2d2d;margin-bottom:16px;\"\u003eThe mix of chip types in one pack matters, because a T5577 can emulate an EM4100 but not every reader accepts it, and an EM4305 sometimes reads where a T5577 will not. Carrying both means the job finishes on the first visit instead of the second. Each fob is ABS cased with a moulded keyring loop that survives being dropped on concrete.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;line-height:1.8;color:#2d2d2d;margin-bottom:16px;\"\u003eFifty blanks is the working quantity for anyone doing installations. It covers a small apartment block, a gym membership batch, or a season of callouts, and it costs less per unit than buying replacements one at a time from a locksmith. Note that cloning credentials you do not own or administer is restricted in many jurisdictions, so keep the use to systems you control.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;line-height:1.8;\"\u003e\u003cem style=\"color:#0a66c2;\"\u003eA blank fob is a fifteen pence answer to a forty pound callout.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003chr style=\"margin:24px 0;border:0;border-top:1px solid #eee;\"\u003e\u003cdiv class=\"product-features\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:20px;margin-bottom:12px;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n\u003cli style=\"margin-bottom:10px;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"color:#0a66c2;margin-right:8px;\"\u003e✦\u003c\/span\u003eFifty rewritable fobs per pack in mixed T5577 and EM4305 chips\u003c\/li\u003e\n\u003cli style=\"margin-bottom:10px;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"color:#0a66c2;margin-right:8px;\"\u003e✦\u003c\/span\u003e125kHz low frequency operation compatible with legacy readers\u003c\/li\u003e\n\u003cli style=\"margin-bottom:10px;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"color:#0a66c2;margin-right:8px;\"\u003e✦\u003c\/span\u003eReadable and rewritable with a standard 125kHz writer\u003c\/li\u003e\n\u003cli style=\"margin-bottom:10px;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"color:#0a66c2;margin-right:8px;\"\u003e✦\u003c\/span\u003eEM4100 emulation support for older access systems\u003c\/li\u003e\n\u003cli style=\"margin-bottom:10px;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"color:#0a66c2;margin-right:8px;\"\u003e✦\u003c\/span\u003eABS housing with a moulded keyring loop\u003c\/li\u003e\n\u003cli style=\"margin-bottom:10px;font-size:15px;line-height:1.7;color:#333;\"\u003e\n\u003cspan style=\"color:#0a66c2;margin-right:8px;\"\u003e✦\u003c\/span\u003eBulk quantity sized for installers and property managers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-specs\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:20px;margin-bottom:12px;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #f0f0f0;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#111;min-width:160px;display:inline-block;\"\u003eModel Number:\u003c\/strong\u003e \u003cspan style=\"color:#444;\"\u003eEM4305 Tags\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #f0f0f0;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#111;min-width:160px;display:inline-block;\"\u003eCertification:\u003c\/strong\u003e \u003cspan style=\"color:#444;\"\u003eCE\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #f0f0f0;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#111;min-width:160px;display:inline-block;\"\u003eOperating Frequency:\u003c\/strong\u003e \u003cspan style=\"color:#444;\"\u003e125kHz low frequency\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #f0f0f0;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#111;min-width:160px;display:inline-block;\"\u003eChip Types:\u003c\/strong\u003e \u003cspan style=\"color:#444;\"\u003eT5577 and EM4305, mixed per pack\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #f0f0f0;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#111;min-width:160px;display:inline-block;\"\u003ePack Quantity:\u003c\/strong\u003e \u003cspan style=\"color:#444;\"\u003e50 fobs\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #f0f0f0;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#111;min-width:160px;display:inline-block;\"\u003eHousing:\u003c\/strong\u003e \u003cspan style=\"color:#444;\"\u003eABS plastic with keyring loop\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-applications\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:20px;margin-bottom:12px;\"\u003eWhere It Earns Its Place\u003c\/h3\u003e\n\u003cp style=\"font-size:16px;line-height:1.8;color:#2d2d2d;\"\u003eProperty managers keep a box for tenant turnover, replacing lost fobs the same day instead of waiting on a supplier. Hotel maintenance teams use the blanks for room locks that run 125kHz credentials. Gym and studio operators batch program membership fobs at the front desk. Locksmiths and access control installers carry a mixed pack so a site visit covers whichever chip the reader demands.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-faq\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:20px;margin-bottom:12px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"font-weight:600;color:#111;margin:0 0 4px;\"\u003e\u003cstrong\u003eQ: What writer do I need to program these?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"color:#444;margin:0;line-height:1.7;\"\u003eA: Any 125kHz writer that supports T5577 and EM4305 chips, including the common handheld copiers and USB writers used by locksmiths. Read the source credential first, then write the same data to the blank.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"font-weight:600;color:#111;margin:0 0 4px;\"\u003e\u003cstrong\u003eQ: Can these copy a hotel room key?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"color:#444;margin:0;line-height:1.7;\"\u003eA: Technically the chip can hold the data. Legally, copying a credential you do not administer is restricted in most countries. Use these for systems you own or are contracted to manage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"font-weight:600;color:#111;margin:0 0 4px;\"\u003e\u003cstrong\u003eQ: Will they work with a 13.56MHz system?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"color:#444;margin:0;line-height:1.7;\"\u003eA: No. These are 125kHz low frequency fobs. High frequency 13.56MHz systems such as Mifare need a different chip family and will not read these fobs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"font-weight:600;color:#111;margin:0 0 4px;\"\u003e\u003cstrong\u003eQ: What is the difference between T5577 and EM4305?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"color:#444;margin:0;line-height:1.7;\"\u003eA: Both are rewritable 125kHz chips with slightly different read behaviour. T5577 clones EM4100 credentials readily. EM4305 sometimes reads on readers that reject a T5577, which is why a mixed pack saves repeat visits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"font-weight:600;color:#111;margin:0 0 4px;\"\u003e\u003cstrong\u003eQ: How many times can a fob be rewritten?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"color:#444;margin:0;line-height:1.7;\"\u003eA: In practice thousands of write cycles, far beyond the life of the plastic. The housing fails before the chip does.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"font-weight:600;color:#111;margin:0 0 4px;\"\u003e\u003cstrong\u003eQ: Are the fobs waterproof?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"color:#444;margin:0;line-height:1.7;\"\u003eA: The ABS case resists splashes and rain. They are not rated for immersion, so avoid leaving them in a pocket through a wash cycle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"font-weight:600;color:#111;margin:0 0 4px;\"\u003e\u003cstrong\u003eQ: How do I test a fob before handing it out?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"color:#444;margin:0;line-height:1.7;\"\u003eA: Write the credential, then read it back on the same writer and confirm the ID matches the source. Finish with a live read on the target reader, since some systems check a sector the writer does not display.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"font-weight:600;color:#111;margin:0 0 4px;\"\u003e\u003cstrong\u003eQ: Do you supply the writer as well?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"color:#444;margin:0;line-height:1.7;\"\u003eA: The set covers blank fobs only. Any 125kHz writer on the market handles these chips, and we can quote a reader and writer bundle on request for installation teams.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-promise\" style=\"margin-top:28px;padding:18px 20px;background:#f7f9fc;border-left:3px solid #0a66c2;border-radius:4px;\"\u003e\n\u003ch3 style=\"font-size:18px;margin:0 0 8px;\"\u003eThe EastSupplier Promise\u003c\/h3\u003e\n\u003cp style=\"margin:0;color:#444;line-height:1.75;font-size:15px;\"\u003eEvery unit ships from a vetted production partner, is inspected against the specification sheet above, and travels with tracking from the factory floor to your door. If a parcel arrives damaged or out of spec, our team replaces or refunds it without a debate. Questions before you order go to a human who has handled the product, not to a script.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-gallery\" style=\"margin-top:30px;text-align:center;\"\u003e\n\u003ch3 style=\"font-size:20px;margin-bottom:15px;\"\u003eGallery\u003c\/h3\u003e\n\u003cdiv style=\"display:inline-block;width:32%;margin:0 0.5% 10px;vertical-align:top;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S75c5644c2a224627af708cd37896e6f3J.webp?v=1711760181\" alt=\"Product detail\" style=\"width:100%;height:auto;border-radius:6px;border:1px solid #eee;\" loading=\"lazy\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"display:inline-block;width:32%;margin:0 0.5% 10px;vertical-align:top;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S2e29490f0cb945789d025ec3e9c29edeB.webp?v=1711760180\" alt=\"Product detail\" style=\"width:100%;height:auto;border-radius:6px;border:1px solid #eee;\" loading=\"lazy\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"display:inline-block;width:32%;margin:0 0.5% 10px;vertical-align:top;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S23a8d37bac25499cb7cda81f40f0e898I.webp?v=1711760180\" alt=\"Product detail\" style=\"width:100%;height:auto;border-radius:6px;border:1px solid #eee;\" loading=\"lazy\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"display:inline-block;width:32%;margin:0 0.5% 10px;vertical-align:top;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sa6bc74939e6749a49d48097ceef13faen.webp?v=1711760180\" alt=\"Product detail\" style=\"width:100%;height:auto;border-radius:6px;border:1px solid #eee;\" loading=\"lazy\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"display:inline-block;width:32%;margin:0 0.5% 10px;vertical-align:top;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S5b888c112dfc4ea680ba3d99df675423X.webp?v=1711760180\" alt=\"Product detail\" style=\"width:100%;height:auto;border-radius:6px;border:1px solid #eee;\" loading=\"lazy\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"Product\", \"name\": \"The Blank Key | 50-Piece T5577\/EM4305 125kHz Rewritable Fob Set\", \"description\": \"Fifty rewritable 125kHz proximity fobs on T5577 and EM4305 chips for access control duplication, hotel systems and low frequency card replacement.\", \"brand\": {\"@type\": \"Brand\", \"name\": \"EastSupplier\"}, \"sku\": \"8415665914079\", \"url\": \"https:\/\/eastsupplier.com\/products\/the-blank-key-t5577-em4305-125khz-rewritable-fobs\", \"image\": [\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S75c5644c2a224627af708cd37896e6f3J.webp?v=1711760181\"], \"aggregateRating\": {\"@type\": \"AggregateRating\", \"ratingValue\": \"4.8\", \"reviewCount\": \"3\"}, \"offers\": {\"@type\": \"Offer\", \"priceCurrency\": \"USD\", \"price\": \"47.37\", \"availability\": \"https:\/\/schema.org\/InStock\", \"url\": \"https:\/\/eastsupplier.com\/products\/the-blank-key-t5577-em4305-125khz-rewritable-fobs\", \"seller\": {\"@type\": \"Organization\", \"name\": \"EastSupplier\"}}}\u003c\/script\u003e","brand":"East Supplier Platform","offers":[{"title":"Pink","offer_id":45184676397279,"sku":"33039925301-Pink","price":47.77,"currency_code":"USD","in_stock":true},{"title":"Grey","offer_id":45184676430047,"sku":"33039925301-Grey","price":47.6,"currency_code":"USD","in_stock":true},{"title":"Purple","offer_id":45184676462815,"sku":"33039925301-Purple","price":47.74,"currency_code":"USD","in_stock":true},{"title":"Blue","offer_id":45184676495583,"sku":"33039925301-Blue","price":47.74,"currency_code":"USD","in_stock":true},{"title":"Mixed color","offer_id":45184676528351,"sku":"33039925301-Mixed color","price":47.7,"currency_code":"USD","in_stock":true},{"title":"Yellow","offer_id":45184676561119,"sku":"33039925301-Yellow","price":47.77,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":45184676593887,"sku":"33039925301-Red","price":47.41,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":45184676626655,"sku":"33039925301-Black","price":47.65,"currency_code":"USD","in_stock":true},{"title":"Green","offer_id":45184676659423,"sku":"33039925301-Green","price":47.37,"currency_code":"USD","in_stock":true},{"title":"Army green","offer_id":45184676692191,"sku":"33039925301-Army green","price":47.77,"currency_code":"USD","in_stock":true},{"title":"Orange","offer_id":45184676724959,"sku":"33039925301-Orange","price":47.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S75c5644c2a224627af708cd37896e6f3J.webp?v=1711760181","url":"https:\/\/eastsupplier.cn\/products\/the-blank-key-t5577-em4305-125khz-rewritable-fobs","provider":"EastSupplier Platform","version":"1.0","type":"link"}