Dtronics DT-MTC, USB MTC Relay / Display, USB plug & play MIDI interface with HUI support, MIDI in via 3.5 mm stereo jack, Power supplied via USB, Relays for e.g. ""on air"" lamp (switches during recording), Relay switching capacity: 24 Volt 2 Ampere, Dimensions: 66 x 66 x 30 mm, Weight: 0.80 kg, Includes USB cable