Specification :

Built-in High quality amplifier
Thin and simple design
Recharge and playback for iPhone
AC adaptor included
Battery powered( 4 AA size or rechargeable, not included)
Powerful and Crystal sound qaulity from 2pcs of 2.25inch driver unit
Bass booster function
3.5mm Aux jack for connection to other MP3, CD, Laptop�
Output power: 4Wx2
With a frequency switch for frequency change