Alesis SR 16 drum machine - 4 audio outputs (2 stereo pairs), 12 velocity-sensitive pads (with articulation dynamics), 16/18-bit sample / CAD resolution, 233 sounds, 12 pad-accessed sounds, 120 MIDI-accessed sounds, 16-voice polyphony, 7 user-programmable speed pan positions, response: 8 levels via pads (127 via MIDI), timing resolution: 96 PPQN, signature time range: 1 to 128 beats per pattern, tempo range: 20-255 beats per minute, notes: 12,000, patterns: 400 (200 user, 200 preset), songs: 100, kits: 50 user, 50 default sync, MIDI clock / Song Position Pointer, pedal functions: start / stop, count / A / B fill / and other features: sound stacking edit step, stereo samples with reverb and ambience. Power: external 9VAC transformer. Dimensions (LxWxD): 235x38x165mm, weight: 1.1 kg. Power supply included.