{"product_id":"100pcs-125khz-em4100-rfid-keyfob-tags-access-control","title":"100pcs 125KHz EM4100 RFID Tags – Access Control Keyfobs","description":"\n\u003ch2\u003e100-Pack 125KHz EM4100 RFID ID Tags — Reliable Access Control \u0026amp; Time Attendance\u003c\/h2\u003e\n\u003cp\u003eUpgrade your building security, time-attendance system, or intercom setup with this bulk pack of \u003cstrong\u003e100 x 125KHz EM4100 \/ TK4100 RFID keyfob tags\u003c\/strong\u003e. Each tag is read-only, pre-programmed with a unique ID, and built to perform consistently scan after scan in demanding environments.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose These RFID Tags?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal 125KHz Frequency\u003c\/strong\u003e — Compatible with the vast majority of standard RFID readers, access control panels, time-attendance terminals, and intercom systems using EM4100 or TK4100 protocol.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Fast Reading\u003c\/strong\u003e — 1–2 ms read speed means virtually instant, seamless entry — no delays at the door.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReliable Short-Range Detection\u003c\/strong\u003e — Reads cleanly at 1–5 cm, reducing false triggers while keeping access smooth and convenient.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExceptional Durability\u003c\/strong\u003e — Rated for over 100,000 read cycles. The RF chip is sealed in high-quality epoxy resin and welded ultrasonically inside a corrosion-resistant, high-temperature-resistant shell.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Operating Temperature\u003c\/strong\u003e — Performs reliably from -20°C to 85°C, suitable for both indoor and outdoor installations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRead-Only Security\u003c\/strong\u003e — Factory-encoded unique ID cannot be overwritten, preventing accidental or unauthorized cloning.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBulk Value\u003c\/strong\u003e — 100 tags per order — ideal for offices, apartment complexes, schools, gyms, warehouses, and any facility needing a full credential rollout.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE Certified\u003c\/strong\u003e — Meets CE compliance standards for quality and safety.\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\u003e125 KHz\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\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 pcs per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e100 × 125KHz EM4100 \/ TK4100 Read-Only RFID Keyfob Tags\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDoor access control systems\u003c\/li\u003e\n  \u003cli\u003eEmployee or visitor time-attendance tracking\u003c\/li\u003e\n  \u003cli\u003eApartment and building intercom entry\u003c\/li\u003e\n  \u003cli\u003eGym, school, or library membership cards\u003c\/li\u003e\n  \u003cli\u003eWarehouse and asset management\u003c\/li\u003e\n  \u003cli\u003eParking lot access\u003c\/li\u003e\n\u003c\/ul\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 tags compatible with my existing access control reader?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — these tags operate at the industry-standard 125KHz frequency using the EM4100 \/ TK4100 protocol, which is compatible with the vast majority of commercially available RFID access control readers, time-attendance systems, and intercoms that support EM4100 or TK4100 credentials. Always confirm your reader supports 125KHz EM4100 before ordering.\u003c\/p\u003e\n\u003ch4\u003eQ: Can these RFID keyfob tags be reprogrammed or cloned?\u003c\/h4\u003e\n\u003cp\u003eA: No. These are factory-encoded, read-only tags. The unique ID stored on each chip cannot be overwritten, which provides an added layer of security and prevents unauthorized duplication.\u003c\/p\u003e\n\u003ch4\u003eQ: How durable are these RFID tags for outdoor or harsh environments?\u003c\/h4\u003e\n\u003cp\u003eA: Very durable. Each tag's RF chip is sealed in epoxy resin and ultrasonically welded inside a corrosion-resistant, high-temperature-resistant shell. They operate reliably in temperatures from -20°C to 85°C and are rated for over 100,000 read cycles, making them suitable for both indoor and outdoor applications.\u003c\/p\u003e\n\u003ch4\u003eQ: How many tags come in this pack and what is the reading range?\u003c\/h4\u003e\n\u003cp\u003eA: This listing includes 100 RFID keyfob tags. The effective reading distance is 1–5 cm, which is standard for 125KHz proximity access control systems and ensures controlled, deliberate scans at entry 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 tags compatible with my existing access control reader?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — these tags operate at the industry-standard 125KHz frequency using the EM4100 \/ TK4100 protocol, which is compatible with the vast majority of commercially available RFID access control readers, time-attendance systems, and intercoms that support EM4100 or TK4100 credentials. 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