Main Features:  
- Bluetooth V4.1, compatible with most devices and high speed connection
- Wireless connection, stereo HiFi earphones, suit for outdoor sports
- Noise reduction technology, isolated from the world and ensures clear calls
- Sweat and water proof

Specification:  
Bluetooth: V4.1 
Transmission range: 10m
Battery: 50mAh Li-ion battery
Music time: 4.5h
Charging time: 2h
Standby time: 100h
Impedance: 32 ohm
Cable length: 28cm 0.079 Package weight: 0.106 kg
Package Size(L x W x H): 10.00 x 10.00 x 5.50 cm / 3.94 x 3.94 x 2.17 inches Package Contents: 1 x Earphones, 1 x English User Manual, 5 x Earbud, 1 x USB Cable