-Output Power > 450 mW -Speaker: Diameter 40mm / Impedance 4 Ohm / Power 3W -Earphone Jack: Diameter 3.5mm -Power supply: -Rechargeable battery: Li-ion 3.7V -External adaptor: USB jack, DC 5V, Current >300mA -Dimensions: approx. 7 ½ (W) X 4 ½ (H) X 1 ¼ (D) -Weight: 1 lb 3 oz(battery not included)