USB connection for audio in/out, 4-track simultaneous recording on SD/SDHC card, power supply, recording format: HiFi (MT2) Roland/Boss format and 16bit stereo WAV format (Song Sketch only), stereo line input (3.5mm mini-jack), integrated Boss effects like COSM amp simulations and guitar effects from GT-1, 8-track playback + stereo drum track, LCD display. Connections: guitar/bass input (jack), stereo headphones output, USB audio interface and effects engine (24bit/44.1kHz), 4x mic/line inputs (XLR and 1/4" jack / input 4 with 48V phantom power), footswitch and expression pedal connection, USB cable, line out (RCA), data file transmitting and bus power. Includes SD-card, MIDI in/out, dimensions: 288 x 58 x 184mm (WxHxD). Weight: 0.872kg