2015 new model   wireless bluetooth stereo 4.0 sport neckband headset BM-170 

1- Charging voltage:               MICRO USB 5V
2-Working current:                10-20mA
3- Bluetooth Working range:        10M
4-Output power:                  2x18mW  
5-Frequency range:                2.401-2.480GHz
6- Distortion factor:               ≤1%
7-Frequency response:             20Hz-20KHz
8-Working Time:                 Music state 10 H/ Talkingstate 15H
9-SNR:                         S/N≥95
10- Charging Time:                2h
11-Bluetooth name:                BM-170 
12-Speaker:                    16Ω20mW x 2
13-Battery:                     3.7V/220MAH (Polymer rechargeable battery)
14-ANC frequency                100-1000HZ
15-ANC level                    15-20dB
16-Standby time                 ≥500H
17-working environment          -10~60℃