Electronics-Salon Audio Input Selector Relay Board, With 12V regulator Audio input selector module board, with 12V DC voltage regulator. Power Supply: 11 to 22V AC. or 15 to 32V DC. Regulator output: 12V DC / 1 Amp. FR-4 Fiber glass PCB ( Double Layer ). Size: 100mm(L) x 50mm(W) x 38mm(H), (3.94 x 1.97 x 1.5 inch).