5 watts of gigantic earth shattering power, a 5" loudspeaker, AC/DC operation. Optional AC adapter incuded. SPECIFICATIONS: Power output: 5 watts Speaker: 5" Batteries: 6 AA batteries, included AC Operation: Yes, with optional AC adapter (not included) Dimensions: 6-1/4" x 5" x 9-1/2" Weight: 6 lbs.