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: the bluetooth 2.1 + specificationModule working voltage VCC: DC 12 vDC control maximum voltage: DC 30 v Exchange control maximum voltage: AC 250 vColour:BlueMaterial:PCBSize:62 x 20mmPackage Contents:1 x 12v relay moduleOnly the above package content, other 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.