Product Feature: Specifications: 1. Material: zinc alloy 2. Working voltage: 3.0-4.2V 3. Lock weight and Size: 90g, 7.6*4.6.1.3(cm) 4. Fingerprint sensor coverage: 72*64MM 5. Unlock speed: within 1 second 6. working period: a year per power Charge 7. LED light: three color light: red / blue / green 8. Battery: 3.7V lithium build in battery 9. Working temperature: -10~+40 Read more about Smart Fingerprint Keyless USB Rechargeable Door Lock Fingerprint Smart Padlock Quick Unlock Padlock with Finger Print Control[…]