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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. 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 make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!