USB speaker. For MP3, laptop, mobile phone. Power by AAA battery or USB port. Foldable and portable. USB speaker1, Portable and foldable, carrry with anywhere ... ; Ideal to use at office, home, camping; Precision volume control; USB connection and stereo cable; 3, Power supply: 4*AAA batteries ... ,40pcs/carton,size:50*42*20cm; G.W:11.5KG USB speaker