Specification: Features: 12-button touch button with backlight, with automatic door lock and manual door lock modes. Adopts micro USB interface of emergency power supply, which is convenient for use with mobile phone chargers or charging device. Supports any combination of 4 to 10 digits for user and management. And the key amount is up to 10 million groups, providing you with much convenience. It will automatically alarm after entering incorrect password 3 times, safer and more reliable. With a power supply of 3 AAA batteries, it has low power consumption. The battery life is more than one year, and the lock is automatically notified when the power is insufficient. Suitable for cabinets, drawers, shoe cabinets, office cabinets, newspaper boxes, metal cabinets, wooden cabinets, tool boxes, mailboxes, school lockers, etc. Specification: Power supply: 3 AAA batteries (not included) Power supply: 4.5V Low voltage: 3.6V 0.2V Current: 20uA (quiescent current), 200mA (dynamic current) Operating temperature: 0- 55C Working humidity: 20% to 80% RH Lock box usage time: > 20,000 times Battery life: > 4000h Lock material: plastic hardware combination Lock box material and locking latch: ABS plastic. Lock Processing: Acrylic Lock Case Power Supply: 3 AAA Batteries (Not Included) Size: Lock: Approx. 95x23.5x9.5mm/3.7x0.9x0.4in Lock Latch: Approx. 73x24x12mm/2.9x0.9x0.5in Lock Box: Approx. 57x84x23mm/2.2x3.3x0.9in Package List: 1 x Electronic Password Lock 1 x Lock Box 1 x Lock Catch 1 x Pack of Screws 1 x Connection Cable