Product Description:
1. Unique neck-band design for easy carrying
2. Ultra-light weight for all day comfort
3. Retractable Earphones
4. Noise reduction & Echo cancellation
5. A2DP, music player support
6. Same time connect 2 phones
7. vibration when calling
8. Lossless sound transmission

Specifications:
Bluetooth version: V4.1+EDR
Transmission distance: 10 meters
Battery capacity: 200mAh
Talk time: 8-10 hours
Music time: 8-10 hours
Standby time: 500 hours
Charging time: 1-2 hours
Speaker:16Ω10mW x 2
Sensitivity: DBM -80
Signal to noise ratio: 95dB
Bearing: all directions
Frequency range: 2.402GHz-2.480GHz
Transmit power: 0dBm. Second (4dBm Max)
Working voltage: 3.7V
Working current: 20mA