... Bluetooth Speaker Φ36mm, 1.5W 8Ω±15%, 120±3dB, 380Hz±20%HZ, Distortion rate:5% less( the specification for the speaker ... can be customised according to your requested) * USB 5P * Power and battery Built in 250ma hLithium battery,speaker ... working time: 2-4hour,Can charger by Power adapter or USB Connect with computer * It can be used to connect with Computer,Mobile Phone ...