With built-in lithium battery,
Work with many audio players like laptop/mp3/mp4 etc.
Shell materials:QIMEI ABS757
Speaker:MAGNETISM PREVENT(4φ)36MM*2W
Rating power:1.7W
Frequency response:100HZ-22KHZ
Signal-to-Noise:≥80db
Polymer battery capacity:300MAH
Polymer battery charging Voltage:4.2V±0.05V
Distortion:≤0.5%
AMP freq range:280Hz-16KHz
Battery Charge time:DC 5V 200MA_300MA around 2.5 hours
Battery Discharge time:MP3 volume in 31mv,about 2 hours;MP3 volume in 20mv,around 8 hours(in the basic of volume level,music rhythm ect long or short of time)