Features:

CSR Bluetooth 4.1

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

Specification:

Bluetooth version: V4.1

Frequency range: 2.4GHz-2.48GHz

Operating distance: Up to 10m (free space)

Bluetooth profiles: A2DP, AVRCP, HSP, HFP

Standby time: Up to 180hrs

Talk/music playtime: Approximately 4 -5hours

Charging time: Approximately 2 hours

Frequency response: 20Hz-20kHz

Operational temperature: -10 to 50°C