1、Password unlocking, and the longest 15‑digit 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. 2、Low 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. 3、If the password is entered incorrectly for 3 consecutive times, the password lock will alarm for 60 seconds, output the correct password to unlock. 4、Support long‑term standby (built‑in battery), and the use time can up to 6‑9 months. 5、With USB emergency charging hole, it can be charged through it in an emergency. 1 x Lock1 x Lock Box1 x Installation Kit1 x Instruction Item Type: Password Cabinet LockMaterial: Zinc alloy + ABS plasticPassword Length: 1-15 digitsWorking Voltage: DC 2.3- 3.3VBattery Specification: LIR2032 (Rechargeable)Battery Capacity: 80mAh (Built-in)Standby Current: ≤ 6μAMaximum Current: Average value ≤ 5mABattery Life: 6-9 monthsInstallation Hole Diameter: Approx. 16-19mm/ 0.6- 0.7inBoard Thickness Requirement: > 0.5mm/ 0.02inWorking Temperature: -20-70℃Relative Humidity: 20%-80%