{"product_id":"rfid-125khz-proximity-keyfob-tags-tk4100-em4100-access-control","title":"RFID 125KHz Proximity Keyfob Tags – TK4100 EM4100, 8 Colors","description":"\n\u003ch2\u003eRFID 125KHz Proximity Keyfob Tags – TK4100 \/ EM4100 Compatible\u003c\/h2\u003e\n\u003cp\u003eUpgrade your access control or time-attendance system with these reliable \u003cstrong\u003e125KHz RFID Proximity Keyfob Tags\u003c\/strong\u003e. Compatible with the widely used TK4100 and EM4100 chip standards, these compact keyfobs are built for everyday convenience — whether you're managing office entry, gym access, or attendance tracking. Choose from \u003cstrong\u003e8 color options\u003c\/strong\u003e to easily organize or distinguish users at a glance.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChip Standard:\u003c\/strong\u003e TK4100 \/ EM4100 (125KHz read-only)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Durable ABS plastic housing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Approx. 43.7 × 30.5 × 5.3 mm — slim and pocket-friendly\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -40°C to 85°C — suitable for indoor and outdoor environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWaterproof:\u003c\/strong\u003e Splash- and rain-resistant for reliable daily use\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Built-in key ring loop for easy attachment to keys or lanyards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColors Available:\u003c\/strong\u003e 8 color options for simple user differentiation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility \u0026amp; Use Cases\u003c\/h3\u003e\n\u003cp\u003eThese RFID keyfobs are designed to work seamlessly with standard 125KHz access control readers and time-attendance terminals that support TK4100 or EM4100 protocols. Ideal for:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOffice and building access control\u003c\/li\u003e\n  \u003cli\u003eGym, club, and facility entry systems\u003c\/li\u003e\n  \u003cli\u003eEmployee time-attendance tracking\u003c\/li\u003e\n  \u003cli\u003eSchool or residential gate systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDurable \u0026amp; Practical Design\u003c\/h3\u003e\n\u003cp\u003eHoused in sturdy ABS plastic, each keyfob is built to withstand the wear and tear of daily handling. The wide operating temperature range makes them dependable in warehouses, outdoor entry points, and other demanding environments. The integrated key ring means your team can carry them effortlessly alongside their regular keys.\u003c\/p\u003e\n\n\u003cp\u003eLooking to expand your DIY and organizational toolkit? You might also enjoy the \u003ca href=\"\/products\/gold-silver-drawstring-jewelry-gift-bags-pouches-50pcs\"\u003e50pcs Gold \u0026amp; Silver Drawstring Jewelry Gift Bags 7x9 9x12cm\u003c\/a\u003e for secure storage, or browse our \u003ca href=\"\/products\/ccb-flat-round-spacer-beads-diy-jewelry-making\"\u003e4\/6mm CCB Flat Round Spacer Beads DIY Jewelry Making 100-200pcs\u003c\/a\u003e for creative projects. For versatile crafting wire, check out the \u003ca href=\"\/products\/round-aluminum-wire-diy-jewelry-making-1mm-3mm\"\u003eRound Aluminum Wire 1mm–3mm | DIY Jewelry Making Wire\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What chip standard do these RFID keyfob tags use, and are they compatible with my reader?\u003c\/h4\u003e\n\u003cp\u003eA: These keyfob tags use the TK4100 \/ EM4100 chip standard operating at 125KHz. They are compatible with the vast majority of standard 125KHz access control readers and time-attendance terminals that support read-only EM\/TK format — one of the most common formats worldwide.\u003c\/p\u003e\n\u003ch4\u003eQ: Are these RFID keyfobs waterproof?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The keyfobs feature a splash- and rain-resistant ABS plastic casing, making them suitable for everyday outdoor use such as gate entry systems or car parks. They operate reliably across a temperature range of -40°C to 85°C.\u003c\/p\u003e\n\u003ch4\u003eQ: What size are the keyfobs and how are they carried?\u003c\/h4\u003e\n\u003cp\u003eA: Each keyfob measures approximately 43.7 × 30.5 × 5.3 mm — compact enough to sit comfortably on a keychain. Every tag includes a built-in key ring loop so it can be attached to keys, lanyards, or badge holders with ease.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use different colors to manage multiple users or access levels?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. These RFID proximity keyfob tags are available in 8 distinct colors, making it easy to color-code users, departments, or access zones for quick visual identification at a glance.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What chip standard do these RFID keyfob tags use, and are they compatible with my reader?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These keyfob tags use the TK4100 \/ EM4100 chip standard operating at 125KHz. They are compatible with the vast majority of standard 125KHz access control readers and time-attendance terminals that support read-only EM\/TK format — one of the most common formats worldwide.\"}}, {\"@type\": \"Question\", \"name\": \"Are these RFID keyfobs waterproof?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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