*Wide Application: perfectly used for doors, cabinets, bikes, backpacks, storage lockers, etc. *Easy Operation: no need any tools, you can add or delete fingerprints easily by following the instructions of the user manual. *10 Groups of Fingerprints: the padlock supports up to 10 fingerprints recording(support two administrators).Specifications:1.Material: zinc alloy2.Working voltage: 3.0-4.2V3.Lock weight and Size:90g,7.6*4.6*1.3(cm)4.Fingerprint sensor coverage: 72*64MM5.Unlock speed: within 1 second6.working period: a year per power Charge7.LED light: three color light: red / blue / green8.Battery: 3.7V lithium build in battery9.Working temperature: -10~+40 degrees Celsius10.Fingerprint capacity: record 10 times and save 10 groups