Alesis SR16, Drum machine, 16-Voice polyphony, 233 Realistic, natural stereo sounds, 50 Preset + 50 user drum sets, Tempo adjustable from 20-255 bpm, 4 Outputs (2 stereo outputs), 2 Connections for footswitch (start/stop, count/A/B/fill), Large LCD display, Sync: MIDI Clock / Song Position Pointer, 12 Velocity sensitive drum pads, Dimensions (L x H x D): 235 x 38 x 165 mm, Weight: 1.1 kg, Incl. power adapter