It's not just a earphone But the voice and true wireless you enjoy. Colour
Bluetooth version: 4.1  

Profile: A2DP, AVRCP, HSP, HFP

RF Carrier frequency: 2402-2480 MHz

Range: 10 Meters 


Diameter: Φ40mm


Frequency response: 20Hz - 20KHz    

Sensitivity: 113 ± 3dB


Mic Spec:4*1.5mm

Sensitivity:-42 ± 3dB


Battery Spec: 3.7V  520mAh polymer lithium battery   
Battery size: 58*29*30 mm  
Battery lifetime: 300 times ( discharging capacity ≥ 80%)
Product size: 159*185*79.5mm

Weight: 240g (spare unit without packaging)

Working voltage:  3.7 V

Low power indication:  3.4 V

Working time:  about 25 hours

Charging voltage:  DC 5V

Charging port:  Micro USB Port

Charging time: 1-2 hours

Auto off standby time: 5 minutes

Multi-points: can connect two devices at the same time

Battery display: support IOS system power display
Wireless Freedom.

3.5mm jack for Aux-in functions.

Adjustable headband fits everyone.

Fold flat design for easy storage on the go.

Soft ear cushions for long listening comfort.

Powerful 40mm drivers for refreshingly loud and crystal clear playback.

Long lasting batter life lasting up to twenty-five hours after a fully charge.

Advanced Bluetooth CSR version 4.1 for unrestricted movement and enjoyment.

Built-in microphone and on board functional keys for taking calls,adjusting volumes and switching play-lists. 
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