{"product_id":"200-pack-125khz-rfid-keyfob-tk4100-access-control-tags","title":"200-Pack 125KHz RFID Keyfobs TK4100 Door Access Control Tags","description":"\n\u003ch2\u003e200-Pack 125KHz RFID Keyfobs – TK4100 Proximity ID Tags for Access Control\u003c\/h2\u003e\n\u003cp\u003eSecure and streamline your entry system with this value-packed set of \u003cstrong\u003e200 x 125KHz RFID Keyfob Tags\u003c\/strong\u003e. Built on the reliable \u003cstrong\u003eTK4100 chip\u003c\/strong\u003e, these compact, lightweight keyfobs are compatible with standard EM ID card readers and are ideal for offices, residential communities, schools, hotels, parking lots, and more. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Waterproof ABS Shell\u003c\/strong\u003e – High-quality ABS construction offers excellent waterproof, shockproof, and anti-corrosion performance for dependable everyday use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Portable\u003c\/strong\u003e – Measures just 29 × 33 × 6 mm — small enough to slip into a pocket or backpack. Each tag includes a metal key ring for easy attachment to keychains or lanyards.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTK4100 Chip Technology\u003c\/strong\u003e – Working frequency of 125KHz; fully compatible with standard EM ID access control devices and ID card readers. Each chip carries a unique ID stored internally and printed on the back for easy identification.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRead-Only Security\u003c\/strong\u003e – Write-protected chips prevent unauthorized reprogramming, adding an extra layer of security to your access system.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility\u003c\/strong\u003e – Works with 125KHz card readers with a reading distance of 0–10 cm. \u003cem\u003eNote: Not compatible with HID, UHF, or encrypted readers (e.g. Kaba, Indala, Honeywell, Paradox, APCiK, Isonas).\u003c\/em\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTwo Color Options\u003c\/strong\u003e – Available in red and blue for easy visual identification across different user groups or access levels.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Applications\u003c\/strong\u003e – Perfect for door entry systems, hotel locks, employee attendance tracking, campus access, identity verification, parking lot gates, and security systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChip Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTK4100\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRead\/Write\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRead Only\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReading Distance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–10 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e29 × 33 × 6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eABS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlue, Red\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e200 × 125KHz RFID Keyfob Tags\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-in-1-multi-functional-bone-wrench-hex-socket-spanner-portable-repair-hand-tool-for-bicycle-motorcycle-furniture-assembly\"\u003e10 in 1 Multi-Functional Bone Wrench Hex Socket Spanner – Portable Repair Hand Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/3-in-1-precision-eyeglass-screwdriver-keychain-portable-mini-screwdriver-for-glasses-watch-spectacles-repair-hand-tool\"\u003e3-in-1 Precision Eyeglass Screwdriver Keychain – Portable Mini Screwdriver\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-2pcs-clear-plastic-pencil-box-with-latch-large-capacity-stationery-storage-case-desk-organizer-for-school-art-supplies-1\"\u003eClear Plastic Storage Case with Latch – Desk Organizer for School \u0026amp; Office\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Are these 125KHz RFID keyfobs compatible with my existing access control reader?\u003c\/h4\u003e\n\u003cp\u003eA: These keyfobs use the TK4100 chip at 125KHz and are compatible with most standard EM ID access control readers and ID card readers with a reading distance of 0–10 cm. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with HID, UHF, or encrypted readers such as Kaba, Indala, Honeywell, Paradox, APCiK, or Isonas. Check your reader's chip compatibility before purchasing.\u003c\/p\u003e\n\u003ch4\u003eQ: Can these RFID keyfob tags be reprogrammed or written to?\u003c\/h4\u003e\n\u003cp\u003eA: No. The TK4100 chips are \u003cstrong\u003eread-only\u003c\/strong\u003e and write-protected, meaning they cannot be reprogrammed. Each chip comes pre-assigned with a unique ID, which is both stored in the chip and printed on the back of the tag for easy reference and added security.\u003c\/p\u003e\n\u003ch4\u003eQ: What are the dimensions and how portable are these keyfobs?\u003c\/h4\u003e\n\u003cp\u003eA: Each keyfob measures 29 × 33 × 6 mm — a compact, drop-shaped design that fits easily in pockets, bags, or wallets. Every tag includes an attached metal key ring so it can be conveniently added to a keychain or lanyard.\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\": \"Are these 125KHz RFID keyfobs compatible with my existing access control reader?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These keyfobs use the TK4100 chip at 125KHz and are compatible with most standard EM ID access control readers and ID card readers with a reading distance of 0–10 cm. They are not compatible with HID, UHF, or encrypted readers such as Kaba, Indala, Honeywell, Paradox, APCiK, or Isonas. 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