Our rings are carefully made of stainless steel. _x000D_ Designed specifically for adapting to smart access control/attendance system interconnection. _x000D_ How to use is extremely convenient: make sure your phone has NFC function. _x000D_ Turn on the NFC function in your phone settings. _x000D_ Download the NFC function app in the application software market and complete the ring binding according to the instructions. The ring chip is close to the NFC sensing area of ​​the phone. _x000D_ And shortcuts and application scenarios can be set as needed. _x000D_ The design is ergonomic, comfortable and has no burden to wear. _x000D_ Electronic business card/attendance/access control/smart home control. _x000D_ _x000D_ Net content: 1pc<br>_x000D_ _x000D_ Product name: Ring<br>_x000D_ _x000D_ Keywords: Accessories<br>_x000D_ _x000D_ Gross weight: 24g<br>_x000D_ _x000D_ Packaging size: 5.4*3.4*5.4cm<br>_x000D_ _x000D_ Product size: Ring: 0.8*2.5cm, Ring box: 5.2*3.2cm<br>_x000D_ _x000D_ Box meter: 56*36*21.5cm<br>_x000D_ _x000D_ Weight of one box: 15.73kg<br>_x000D_ _x000D_ Shelf life: 3 years<br>_x000D_ _x000D_ Storage method: Please store it in a cool and covered area<br>_x000D_ _x000D_ Material: Stainless Steel<br>