12V 2channel relay board module can control various appliances and other equipment that draws large current. It can be controlled directly by microcontroller (raspberry pi, Arduino, 8051, avr, pic, dsp, arm, arm, msp430, ttl logic) optically isolated relays protect your microcontroller from damage if the equipment being controlled fails 12v 2channel relay interface board, each one needs 15 20ma driver current equipped with high current relays 10a 250vAC relay output status indication by LED relay board size: 5 x 3.8 x 1.7Cm (l x w x h) standard interface that can be controlled directly by microcontroller (raspberry pi, Arduino, 8051, avr, pic, dsp, arm, arm, msp430, ttl logic) widely used for all mcu control interface, industrial sector, plc control, smart home control, home automation, etc.. Package contents: 1 x 12v 10a 2ch relay board module.