Function: waterproof, anti-vibration, anti-corrosion. The outer shell is made of high quality material and does not rust. Simple and convenient operation, Small size, buckle, portable. Application scope: access control system; biometric and identification system; warehousing logistics system; security patrol system; hotel, community card system; identification system security patrol, sauna bath door lock, electronic door lock, access control intercom, bank, Communication, railway portation, portation and many other fields; electronic wallets, smart water and electricity meter reading systems and many other industries. Memory:64Bits. Chip:RW1990 Work Type: R/W and encrypt Model: RW1990 iButton Model Number: RFID Key Tag color:Black Material:ABS+stainless steel Package Contents: 10 x Rw1990 TM Key Card Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.