Specifications:

• Bluetooth version:V2.1 + EDR
• Bluetooth support: A2DP
• Bluetooth transmission distance:up to 10 meters
• Total system power:10W
• Pure system power (RMS):5W
• Built-in full range driver:2.5”
• Driver impedance:4 ohm
• Frequency response:150Hz-18KHz
• Battery capacity:800mAh
• Charging voltage:USB 5v
• Battery charging time:2.5 hours
• Battery working/playback time @ 50% volume:5 hours 

https://www.youtube.com/watch?v=3fcClNOtrXw