Works with all sound source with 3.5mm audio interface product like MP3 players, computers, mobile phones and CD players. USB powered. Built-in lithium battery with 3 hours working time. Rotatable housing. Speaker driver unit: 36mm. Battery capacity: 200mAh. Charging time: 2 hours. Subsequent charging time 2-4 hours Material: APS Available colours: White and Red Dimension: 6.4(H) x 6.4(L) x 5.7(W) cm