{"product_id":"100pcs-125khz-em4100-rfid-keyfob-tags-access-control-attendance","title":"100pcs 125KHz EM4100 RFID Keyfob Tags – Access Control \u0026 Attendance","description":"\n\u003ch2\u003e100-Pack 125KHz EM4100 RFID Keyfob Tags for Access Control, Time Attendance \u0026amp; Intercom Systems\u003c\/h2\u003e\n\u003cp\u003eUpgrade your security setup with this bulk pack of \u003cstrong\u003e100 x 125KHz EM4100 Read-Only RFID Keyfob Tags\u003c\/strong\u003e. Compatible with the vast majority of standard 125KHz access control readers, time attendance terminals, and intercom systems, these rugged keyfobs deliver fast, reliable scanning every time. Whether you're managing a small office, apartment building, gym, or warehouse, this cost-effective bulk pack ensures you always have spares on hand.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChip:\u003c\/strong\u003e TK4100 \/ EM4100 — industry-standard read-only chip widely supported by 125KHz readers\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency:\u003c\/strong\u003e 125KHz — compatible with most legacy and modern RFID access control systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorking Type:\u003c\/strong\u003e Read-Only — secure, tamper-proof unique ID for each tag\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReading Distance:\u003c\/strong\u003e 1–5 cm for reliable close-range scanning\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReading Speed:\u003c\/strong\u003e 1–2 ms for near-instant card recognition\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -20°C to +85°C — suitable for indoor and outdoor environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Rated for over 100,000 read cycles for long-lasting performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Anti-corrosion, high-temperature-resistant shell with RF chip sealed in epoxy resin and ultrasonically welded for maximum protection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE Certified\u003c\/strong\u003e — meets relevant European conformity standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal Use Cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDoor access control systems (offices, apartments, warehouses)\u003c\/li\u003e\n  \u003cli\u003eEmployee time and attendance tracking\u003c\/li\u003e\n  \u003cli\u003eIntercom and gate entry systems\u003c\/li\u003e\n  \u003cli\u003eGym, club, or membership access management\u003c\/li\u003e\n  \u003cli\u003eParking and vehicle access control\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e100 x EM4100 \/ TK4100 Read-Only 125KHz RFID Keyfob Tags\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChip\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTK4100 \/ EM4100\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Type\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\u003e1–5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReading Speed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1–2 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-20°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEndurance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;100,000 read cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCE\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 pcs per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhy Choose These RFID Keyfobs?\u003c\/h3\u003e\n\u003cp\u003eThese keyfobs use the globally trusted EM4100 protocol, ensuring broad compatibility with hundreds of reader brands. The epoxy-sealed, ultrasonically welded housing keeps the internal chip protected from dust, moisture, and everyday wear — making them ideal for high-traffic environments. Buying in bulk means you're ready for new hires, replacements, or system expansions without delay.\u003c\/p\u003e\n\n\u003cp\u003eFor more information on RFID technology standards and security best practices, 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 EM4100 RFID keyfobs compatible with my existing access control reader?\u003c\/h4\u003e\n\u003cp\u003eA: These keyfobs use the widely adopted EM4100 \/ TK4100 chip at 125KHz, which is compatible with the vast majority of standard 125KHz RFID access control readers, time attendance systems, and intercom units. Always verify that your reader supports 125KHz EM\/TK4100 protocol before purchasing.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I write new data to these RFID keyfob tags?\u003c\/h4\u003e\n\u003cp\u003eA: No. These are read-only RFID tags, meaning each keyfob carries a permanently encoded, unique ID that cannot be overwritten. This design enhances security by preventing duplication or tampering.\u003c\/p\u003e\n\u003ch4\u003eQ: How durable are these keyfobs for daily use?\u003c\/h4\u003e\n\u003cp\u003eA: Each keyfob is rated for over 100,000 read cycles and is constructed with an anti-corrosion, high-temperature-resistant shell. The RF chip is sealed in epoxy resin and ultrasonically welded, making it highly resistant to dust, moisture, and physical wear in busy environments.\u003c\/p\u003e\n\u003ch4\u003eQ: What operating temperatures can these keyfobs handle?\u003c\/h4\u003e\n\u003cp\u003eA: These RFID keyfobs operate reliably in temperatures ranging from -20°C to +85°C, making them suitable for both indoor environments and moderately exposed outdoor access points.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Are these 125KHz EM4100 RFID keyfobs compatible with my existing access control reader?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These keyfobs use the widely adopted EM4100 \/ TK4100 chip at 125KHz, which is compatible with the vast majority of standard 125KHz RFID access control readers, time attendance systems, and intercom units. 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