{"product_id":"5-pack-125khz-t5577-rewritable-rfid-coin-card-keyfob-access-control","title":"5-Pack 125KHz T5577 Rewritable RFID Coin Cards \u0026 Keyfobs","description":"\n\u003ch2\u003e5-Pack 125KHz T5577 Rewritable RFID Coin Cards \u0026amp; Keyfobs\u003c\/h2\u003e\n\u003cp\u003eUpgrade your access control setup with this handy 5-piece set of ultra-thin 125KHz T5577 RFID coin cards and keyfobs. Engineered with a copper coil and a blank T5577 chip, these cards can be written and rewritten over 10,000 times — making them ideal for offices, hotels, schools, gyms, and anywhere that uses 125KHz proximity access systems.\u003c\/p\u003e\n\n\u003cp\u003eAt just 0.3mm thin and 38mm in diameter, they slip easily into a wallet, stick to the back of a phone case, or attach to a keyring. No battery required — the card draws power inductively from the reader for instant, contactless access.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠️ Important Note:\u003c\/strong\u003e The chip ships blank. You must write data to it using a compatible 125KHz RFID reader\/writer before it can be read by an access system.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChip Model:\u003c\/strong\u003e T5577 — fully rewritable, multi-protocol\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorking Frequency:\u003c\/strong\u003e 125 KHz\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRead\/Write Cycles:\u003c\/strong\u003e 10,000+\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRead\/Write Speed:\u003c\/strong\u003e 1 ms\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDetection Distance:\u003c\/strong\u003e 0–8 cm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Durable PVC with copper coil\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 38mm diameter, 0.3mm thickness (ultra-thin)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e Passive — no external power required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Waterproof, moisture-proof, vibration-proof, anti-corrosion, high-temperature resistant\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSafety:\u003c\/strong\u003e Non-toxic and environmentally friendly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWide Range of Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDoor \u0026amp; gate access control systems\u003c\/li\u003e\n  \u003cli\u003eHotel room locks\u003c\/li\u003e\n  \u003cli\u003eEmployee \u0026amp; staff attendance tracking\u003c\/li\u003e\n  \u003cli\u003eSchool and campus entry management\u003c\/li\u003e\n  \u003cli\u003eMembership management systems\u003c\/li\u003e\n  \u003cli\u003eParking lot entry and payment\u003c\/li\u003e\n  \u003cli\u003eTransportation and municipal services\u003c\/li\u003e\n  \u003cli\u003eSecurity and identification systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications at a Glance\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eChip\u003c\/td\u003e\n\u003ctd\u003eT5577\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFrequency\u003c\/td\u003e\n\u003ctd\u003e125 KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eRead\/Write Cycles\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;10,000\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eRead\/Write Time\u003c\/td\u003e\n\u003ctd\u003e1 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eRead Distance\u003c\/td\u003e\n\u003ctd\u003e0–8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePVC + Copper Coil\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e38 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e0.3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e5 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cp\u003e5 × 125KHz T5577 RFID Coin Card \/ Keyfob (blank)\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-25mm-1000-turn-precision-copper-inductor-coil-diy-electronics\"\u003e0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on RFID technology standards and security, visit the \u003ca href=\"https:\/\/www.nist.gov\/topics\/cybersecurity\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eNational Institute of Standards and Technology (NIST) Cybersecurity Resources\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Are these 125KHz T5577 RFID cards compatible with my existing access control system?\u003c\/h4\u003e\n\u003cp\u003eA: These cards operate at 125KHz and use the T5577 chip, which supports multiple protocols including EM4100, HID, and others. They are compatible with most standard 125KHz proximity access systems. Always confirm your reader supports 125KHz T5577-format cards before purchasing.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Why can't my reader detect the card right out of the package?\u003c\/h4\u003e\n\u003cp\u003eA: The T5577 chips ship completely blank — they contain no pre-written data. You must first use a compatible 125KHz RFID reader\/writer device to write data (such as an ID code) to the card. Once programmed, it will work with any compatible 125KHz reader.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many times can I rewrite these RFID cards?\u003c\/h4\u003e\n\u003cp\u003eA: The T5577 chip supports more than 10,000 read\/write cycles, making these cards highly durable and reusable for long-term access management needs.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I stick this ultra-thin card to the back of my phone?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! At just 0.3mm thick and 38mm in diameter, the coin card is designed to be slim enough to fit between a phone and its case for convenient tap-to-access use.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Are these 125KHz T5577 RFID cards compatible with my existing access control system?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These cards operate at 125KHz and use the T5577 chip, which supports multiple protocols including EM4100, HID, and others. They are compatible with most standard 125KHz proximity access systems. Always confirm your reader supports 125KHz T5577-format cards before purchasing.\"}}, {\"@type\": \"Question\", \"name\": \"Why can't my reader detect the card right out of the package?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The T5577 chips ship completely blank — they contain no pre-written data. You must first use a compatible 125KHz RFID reader\/writer device to write data (such as an ID code) to the card. Once programmed, it will work with any compatible 125KHz reader.\"}}, {\"@type\": \"Question\", \"name\": \"How many times can I rewrite these RFID cards?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The T5577 chip supports more than 10,000 read\/write cycles, making these cards highly durable and reusable for long-term access management needs.\"}}, {\"@type\": \"Question\", \"name\": \"Can I stick this ultra-thin card to the back of my phone?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! At just 0.3mm thick and 38mm in diameter, the coin card is designed to be slim enough to fit between a phone and its case for convenient tap-to-access use.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/oasis-select.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"5-Pack 125KHz T5577 Rewritable RFID Coin Cards \u0026 Keyfobs\", \"item\": \"https:\/\/oasis-select.com\/products\/5-pack-125khz-t5577-rewritable-rfid-coin-card-keyfob-access-control\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"Default Title","offer_id":47751415365737,"sku":"\u003cnone\u003e","price":12.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S2287fdb1a8ca42fc91890a8ce1add011V.webp?v=1783189443","url":"https:\/\/oasis-select.com\/products\/5-pack-125khz-t5577-rewritable-rfid-coin-card-keyfob-access-control","provider":"Oasis Select","version":"1.0","type":"link"}