GEREE 12V 2-Channel Relay Module For Arduino ARM PIC AVR DSP SRD-12VDC-SL-C Relay Interface Board with Optocoupler This module can be used with Arduino Special Sensor Shield V4.0. You can do some simple design about it. This is 2-Channel 12V Relay Module for Arduino PIC ARM AVR DSP. It can be able to control various appliances, and other equipments with large current. Easy to be controlled by a lots of Microcontrollers( Such as Arduino , AVR, PIC, DSP).