This one rocks.
Play music from your phone, tablet, computer or off a MicroSD card (not included).
Connect with Bluetooth or with included 3,5 mm cable.
Charge with external USB charger (not included) or off the USB port on your computer.

Battery capacity: 520 mAh
Playing time: about 5 h
Charging time: about 2 h
Power: 3W
Speaker: 45 mm
Size: Diameter 60 mm, Height 50 mm
Weight: 230g
Frequency response: 280Hz - 16 kHz