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 2 channel relay interface board, each one needs 15 20ma   package includes : – 12v 2 chnl  relay module SKU: PGI-008 Categories: Prayog Blaster, Relay