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Function: waterproof, anti-vibration, anti-corrosion. The outer shell is product of great materials and would not rust. Simple and useful operation, Small size, buckle, portable. Application scope: entry leadership system; biometric tracking and id system; warehousing logistics system; security system; hotel, network card system; id formulation safety , sauna bath door lock, electronic door lock, entry leadership intercom, bank, Communication, railway transportation, transportation and lots of different fields; electronic wallets, wise water and electrical energy meter reading and plenty of different industries. Memory:64Bits. Chip:RW1990 Work Type: R/W and encrypt Model: RW1990 iButton Model Number: RFID Key Tag color:Black Material:ABS+stainless metallic Package Contents: 10 x Rw1990 TM Key Card Only the above equipment content, different item shouldn't included. Note: Light and assorted exhibits could cause the colour of the article within the photo a bit diverse from the real thing. The size allowed error is +/- 1-3cm.