Bluetooth smart lock

- 4-way opening: Bluetooth, Mifare Card, password and mechanical key
- Voice prompt: All settings can be finished by following voice prompt
- Privacy password: xxx+password+xxx, preventing password to be seen by others
- Passage Mode and Non-disturbance Mode optional
- Auto lock when come across a consecutive invalid passwords or cards
- Low Voltage alarm(<4.5V), doorbell
- Huge storage: 50 cards, 50 passwords
- Emergency power supply outside
- Three colors optional
- Zinc alloy material