Specification:

1.Bluetooth chipset: CSR 8635, version 4.0
2.Bluetooth profiles: HSP, HFP, A2DP and AVRCP
3.Battery: Lithium battery 250mAH
4.Music playing time: up to 8 hours
5.Charging time: 2-3 hours
6.Standby time: 300 hours
7.Driver unit: 40mm neodymuium
8.Sensitivity: 98dB±3dB 
9.Microphone Sensitivity: -58dB
10. Support hands-free conversation
11. Support 3.5mm audio in & audio out
12.Support battery indication

Welcome to contact us for more details. (Price on B2B just for reference)