Main Features:
- Special speaker transmits high powerful bass and detailed wireless sound to your ears
- In-ear design gives you long-time comfort
- The best combination of tuner's technology gives you full range audio spectrum and exposes all details of song
- Advanced microphone system for clear calls in windy or noisy environments
- Bluetooth V4.1, transmission range is up to 10m

Specification:
Bluetooth: V4.1
Transmission range: 10m
Battery: 55mAh Li-ion battery
Standby time: 100h
Talking time: 3h
Charging time: 2h
Impedance: 16 ohm
Frequency: 20Hz - 20KHz 0.029 Package weight: 0.053 kg
Product Size(L x W x H): 1.20 x 0.50 x 5.10 cm / 0.47 x 0.2 x 2.01 inches
Package Size(L x W x H): 6.50 x 2.80 x 9.30 cm / 2.56 x 1.1 x 3.66 inches Package Contents: 1 x Earphones, 1 x Ear Hook, 1 x Chinese and English User Manual, 1 x USB Cable