Summarize: LC 12v bluetooth relay module include single channel 12V/10A relay module and SPP-C bluetooth serial port slave module, Can be sent via mobile phone APP commands to control the relay switch. Onboard SPP-C bluetooth serial port slave module, with wireless control function; Module with diode effusion protection, short response time; Onboard bluetooth status indicator light (when not connected flash, slow connection after long ) and relay status indicator light; Control distance 10m (open environment). Technical parameters: Follow the bluetooth 2.1 + EDR specification Module working voltage VCC: DC 12 v DC control maximum voltage: DC 30 v Exchange control maximum voltage: AC 250 v Colour:Blue Material:PCB Size:62 x 20mm Package Contents: 1 x 12v relay module Only the above package content, other products are not included. Note: Light 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.