Connect to TT Lock APP, then you can remotely control your door lock anywhere in the world even if you are from home.Set, change, delete codes that you created anywhere anytime.You can also check door status, battery life and activity logs remotely in real-time. Wireless connect to your home Wi-Fi router and wireless connect to your in Same Wifi network. Wi-Fi can pair as many locks as you . The recommended distance between the and the smart door lock is no more than 32 ft (10 ). Communication mode: bluetooth 4.0/Wifi Support system: TT LOCK APP Power supply: 220V Working current: 200mA size:about 70mmx70mmx26mm Material:plastic colour:White Package Contents: 1 x Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.