Specifications:
Drivers: 57mm speaker * 2
Transducer type: dynamic
Bluetooth version: V4.1
Frequency range: 2.4GHz-2.48GHz
Operating distance: up to 10m (free space)
Bluetooth profiles: A2DP， AVRCP， HSP， HFP
Impedance: 16Ω
Frequency response: 20Hz-20kHz
Sensitivity: 110dB
Distortion:<0.1%(THD)
Music playtime: up to 40 hours
Talk time: up to 45 hours
Standby time: up to 1625 hours
Charging time: about 2 hours
Operational temperature: -10 to 50°C
Color: Black， White， Blue， Red
Main item size: 18.5 * 17.5 * 8.0 cm / 7.28* 6.88 * 3.14in
Main item weight: 193g / 6.8oz
Package size: 20.0 * 17.0 * 8.5 cm / 7. 87 * 6.69 * 3.34 in
Package weight: 443g / 15.65oz

Package List:
1 * Bluedio Bluetooth Headset
1 * Audio Cable
1 * USB Cable
1 * (Chinese， English， French， Spanish， Japanese， German) User Manual