Specifications: 【Multiple opening methods】 – Fingerprint + key , which is very intelligent and convenient. 【Large capacity】 – the fingerprint capacity is very large and can store 30 fingerprints. Convenient for storing fingerprints of family or close friends. 【Super security function】 – the door lock adopts semiconductor and biotechnology to provide first-class security and avoid the same fingerprint. 【Quick unlock】- Ergonomic design. Place fingerprints on the door and you can quickly unlock it in 0.3 seconds. It will automatically lock for you. 【Easy installation】- no power cord or professionals are required. It is suitable for most doors with lever lock and for left and right handles. 【Emergency key】 – the lock is equipped with 2 keys for standby application, which allows you to open the door in a traditional way. Feature: Material: ABS, metal Product Color: black, silver Unlocking Method: Key + Fingerprint Power Supply: 4X AAA Batteries(NOT INCLUDED), USB Charging (Emergency use) Recognition Speed: 0.3s Fingerprint Capacity: 30