Description: -Smart electronic keyless digital door lock, 1 group management code+20 group digital codes+keys; -Universal for left-handed and right-handed; Fits 40-55mm width doors; -Easy install, no wiring needed; -Create and delete access codes for trusted friends and family (up to 20); home safety door entry set; -AA Battery Powered, fits standard wooden door, metal door, glass door, security door; Specification: Material: Zinc Alloy Size(LxWxH): approx. 57x22x135mm/ 2.24x0.87x5.31inch Locking: approx. 60mm/ 2.36inch Fits Door: 40-55mm/ 1.57-2.17inch Battery: 4 x AA(Not included) Operating temperature: -40 - 80 ℃ Working humidity: 20%-85% 1. Alarms when voltage is lower than 4.8V, the buzzer and the red light flash for 5 seconds; 2. Effective management password: A long green light + a long . Incorrect management password: While two long beeps, the indicator light is red. 3. Incorrect lock: At the same time with three long sounds, the indicator light flashes red. 4. Enter the wrong password to open the door: After inputting 3 incorrect passwords in succession, the lock will alarm and turn on red, and the keyboard will lock for about 3 minutes. Package Includes: 1 Set Door Lock