Specification:

Bluetooth version: V4.0 CSR8635
Portable lightweight and sweatproof design
Built-in microphone
Built-in rechargeable Li-ion battery
Multipoint pairing (up to 2 phones)
Voice command for picking up / rejecting calls
Built-in 14.2mm nedymium driver
Clear bass resonance, CVC wind noise reduction, and superior sound isolation
Frequency range: 2.4GHz-2.48GHz
Operating distance: Up to 10m (free space)
Bluetooth profiles: A2DP, AVRCP, HSP, HFP
Standby time: Up to 150hrs
Talk/music playtime: Approximately 6-8hours
Charging time: Approximately 2 hours
Frequency response: 20Hz-20kHz
Operational temperature: -10 to 50°C