The PiRelay 8 is a relay expansion board that can control up to 8 appliances/devices on a load of 250V AC/7 A, 30V DC/10 A, and a trigger voltage of 3.3 V with photo-coupling isolation, allowing users to safely control high voltages or current devices via an HDMI 4.3" capacitive touch screen LCD mounted onboard as an add-on module.