1、There are two unlocking methods, mobile phone wireless WiFi remote unlock/lock controller, remote unlock/lock. 2、The WIFI smart lock can also allow to achieve intelligent interaction with other support for TUYA products. 3、Invisible lock supports indoor installation and use, there is no keyhole outside and no chance for thieves. 4、Once the remote control is lost, you can immediately change the remote control password and make it no longer valid. 5、Zinc alloy shell is sturdy and durable, maximize durability. Simple and convenient installation, no additional wiring required. 6、When the battery power is too low, the LED light will flash one month in advance and ring an alarm to remind you to replace the battery. 7、When the battery is used up, it will automatically unlock to prevent the door from being opened. Designed for home security. Item Type: Remote Control Lock Material: Zinc Alloy Model: 019 Remote Control Main Lock: Power Supply: 2pcs AA Batteries (Not Included) Frequency: 433Mhz (±50Khz) Operating Range: Within Approx. 20m/21.9yd Unlock Mode: Remote Control Unlock//Mobile Phone WIFI Unlock Size: Approx. 155x80x35mm/6.10x3.15x1.38in Remote Control: Size: Approx. 6x3x1cm/2.4x1.2x0.4in Standard Quantity: 4 Power Supply: 1pc Built-in CR2032 Button Battery, 100mAh Maximum Number of Controllers: 16 (Not Included) Function: Lock and Unlock How to use: 1. Insert 4pcs AA batteries (not included) into the product, and then use the remote control to unlock the lock. 2. Download for TUYA Smart APP on the mobile phone, turn on the bluetooth of the mobile phone, and then for TUYA WIFI adapter is inserted into the power plug to connect to the lock. Use the mobile phone to connect to the lock, and use your phone to unlock. 1 x Remote Control Lock 4 x Remote Control 1 x USB WIFI Adapter 1 x Lock Box Bracket 1 x Fixator 1 x Installation Accessory Kit 1 x USB Data Cable 3 x Adhesive 1 x English Manual