Bluetooth standard  VR4.1  Bluetooth protocol A2DP,HSP,HFP,AVRC
Transmission distance 10 m
 Sound Frequency range 80Hz-20KHz
Speaker Output Power 30mm high quality
Speaker SPL 20-20kHz,50mW,110+-3dB
 SNR ≥80dB
Distortion ≤1.0%
 Microphone Sensitivity  -42dB
 working time  8 -10hours
Charging time 1-2H
battery inside 250mAH
others Power on/off, forward/next
Volume+/-;play/paused
Rubber paint on surface
Color: black, white, yellow, blue, red
Gift box packing
User manual,USB line
Logo: 1 color