1. Supports Automatic Induction Switch When Mobile Phone Is Close, No Need For App System Bluetooth Direct Connection 2. Support App/Small Program/Serial Port And Other Methods To Configure Parameters 3. Support At Commands To Modify The Switch Lock Signal Value, Switch Lock Mode And Switch Duration 4. Reserved Uart Interface To Support Sending And Receiving At Commands 5. Low Power Consumption And Stable Performance Product Name: Bluetooth Proximity Switch Single-Channel Relay Module, Automatic Sensing, Mobile Phone Proximity To Unlock Model: Bluetooth Proximity Switch Single-Channel Relay Module Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use Colour: Material:PCB+Plastic Package Contents: 1 x Bluetooth Proximity Switch Single Channel Relay Module 1 x 4P Single Row Pin 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.