Model Number : NO 2 ID keyCertification : NONEChip type : TK4100frequency : 125KHzMaterial : ABSOperation Temperature : -40 to 85 degreewaterproof : IP6510pcs RFID Tag 125KHz Proximity RFID Card Keyfobs Key Fob Access Control Reader Smart ID Card Color Keyfob Please note, TK4100 read-only and can not write. If you want to buy can rewrite the tags, you should buy EM4305 chip tags.Please open the link to purchase EM4305/EM5200 chip tags.Specification:Description:Material: ABSDimension: 43.7x30.5x5.3mmResponse frequency: 125 KHz,Chip type: EM4100, TK4100Operation Temperature : -40°C to 85°CWaterproofApplication scope: public transportation, parking, ID identification, attendance system, ticketing, card payment, product logo, etc.Feature:• Water resistant• Each comes with Key ring included. • Compatible with all RFID reader to gain access • Each token pre-programmed with unique ID which is Laser printing on it