Feature:1. Concealed Design: Built in battery, does not affect the aesthetics of the door, especially suitable for high end residential or shopping malls.2. Efficient and Safe: Advanced electronic control technology, high security performance, refuse to hit, pry or cut the lock, drill saw, technical intrusion, secure and anti theft.3. Convenient Operation: Remote unlocking and wireless card swiping through mobile phones are more intelligent and convenient, saving time and safe.4. Wide Application: Can be used not only for residential doors, but also for access control and anti theft in hotels, apartments, factories, institutions and other places.5. Solid Material: Made of high strength materials, exquisite craftsmanship, long service life, not easy to damage, so that your quality of life is higher, more peace of mind.Specification:Item Type: Smart Door LockMaterial: MetalWireless Frequency: 433MHzRemote Control Distance: 0-15m/0-49ftLock Battery: Four AA battery (not included)Wireless Touch Switch Battery: Four AAA battery (not included)Wireless Card Access Control Machine Battery: Four AAA battery (not included)Low Battery Alarm: The buzzer sounds every 20 seconds or soRetain Battery Power: If the battery level is too low, it will automatically unlock and no longer lockExternal Power Adapter: DC 5V, Micro USB interfaceNumber of Registrable Remote Controls: 50 (storing more than 50 will automatically overwrite previously registered remote controls)Remote Control Battery: 25mAh 27A12V zinc manganese button battery ( built in).Package List:1 xSmart Door Lock1 x Lock Pinch Plate2 x Remote Control1 x Pack of Accessory1 x Wireless Touch Switch1 x Wireless Card Access Control Machine10 x IC Card