1, Bluetooth Solution: Jieli V4.2
2, Drive Unit: 38mm*2
3, Drive Power: 5W*2
4, Max. Input power: 20mW
5, Frequency Response: 20Hz-20KHz
6, Battery: 3.7V 1500mA
7, Built-in microphone for hand-free
8, Transmission Distance: 10 meters
9, Play Time: 3-4H Max VOL , 6H 2/3 VOL