Features: 1) Power supply: DC 9.0V or DC adapter 2) Output: 9V 3) Output power: 2W x 4 4) Frequency response: 80Hz - 18KHz 5) Loudspeaker: 3.6cm x 4 6) Dimensions: 20.5 x 14.0 x 3.0cm 7) Foldable, co***ct and elegant travel speaker that is lightweight and easy to carry