Alesis SR 16 drum machine - 4 audio outputs (2 stereo pairs), 12 velocity sensitive pads (with Dynamic Articulation), 16/18-bit sample/DAC resolution, 233 sounds, 12 sounds accessible via pads, 120 sounds accessible via MIDI, 16-voice polyphony, 7-position user programmable panning, velocity response: 8 levels via pads (127 via MIDI), timing resolution: 96 ppqn, time signature range: 1-128 beats per pattern, tempo range: 20-255 bpm, notes: 12,000, patterns: 400 (200 user, 200 preset), songs: 100, kits: 50 user, 50 preset, sync: MIDI Clock/Song Position Pointer, footswitch functions: start/stop, count/A/B/fill, other features: sound stacking, step editing, stereo samples with reverb and ambience. Power: 9VAC external transformer. Dimensions (WxHxD): 235x38x165mm, weight: 1.1kg. Includes power supply.