1. Support mobile phone proximity automatic sensing switch, no need for APP system Bluetooth direct connection 2. Support multiple ways to configure parameters such as APP/mini program/serial port 3. Support AT to modify switch lock signal value, switch lock mode and switch duration 4. Reserve UART interface to support sending and receiving AT commands 5. Low power consumption and stable performance Sensorless link firmware MB021F (HID) low-power module Power supply port: DC5 usage method: 1. Power the Bluetooth proximity switch single relay module (DC 5-30V power supply) 2. Turn on the Bluetooth system of your phone, search for Bluetooth devices and connect them (starting with ). The initial pairing password is 283456. Check the Bluetooth connection status of your phone, and the module's serial port output connection information 3. Turn off Bluetooth and the relay disconnect; Turn on Bluetooth, the relay turn on 4. For operations such as changing Bluetooth name and password, modifying relay switch lock signal value, switch lock mode and switch duration, Colour:Photo Color Material:plastic Package Contents: 1 x Relay Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.