Specifications:Material: Zinc alloySize: 38*72*20mmWeight: 100 gBattery: built- in 100mAh polymer battery Standby time: 3 months Charging Method: USB Secure& reliable authentication： 20 different fingerprints can be recorded. Never worry about losing your key or forgetting passwords. Your finger is the key!Portable： Biometric fingerprint lock size is small that you can easily place it in your pocket and it is the best choice if you want to take it to the gym, used for cabinet, handbag, backpack, luggage etc. Package includes: Fingerprint lock x1 Thank you for working with us. We sell products in good faith. If you have any questions, please contact us in time. We will solve it for you within 24 hours.