Item Type: Password Cabinet Lock Material: Zinc alloy + ABS plastic Password Length: 1-15 digits Working Voltage: DC 2.3-3.3V Battery Specification: LIR2032 (Rechargeable) Battery Capacity: 80mAh (Built-in) Standby Current: 6A Maximum Current: Average value 5mA Battery Life: 6-9 months Installation Hole Diameter: Approx. 16-19mm/0.6-0.7in Board Thickness Requirement: >0.5mm/0.02in Working Temperature: -20-70 Relative Humidity: 20%-80% Package List 1 x Lock 1 x Lock Box 1 x Installation Kit 1 x Instruction 1Password unlocking, and the longest 15digit password can be set, so there is no need to worry about the problem that the door cannot be opened because the key is lost. 2Low battery reminder function, when the battery is low, the lock can be unlocked about 500 times at this time, please replace the battery as soon as possible. 3If the password is entered incorrectly for 3 consecutive times, the password lock will alarm for 60 seconds, output the correct password to unlock. 4Support longterm standby (builtin battery), and the use time can up to 69 months. 5With USB emergency charging hole, it can be charged through it in an emergency.