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

Specification: 
Bluetooth: V4.1
Transmission range: 10m
Battery: 85mAh Li-ion battery
Music time: 4.5h
Talking time: 6h
Charging time: 1.5h
Standby time: 100h
Impedance: 32 ohm
Cable length: 39cm 0.047 Package weight: 0.072 kg
Package Size(L x W x H): 9.00 x 7.00 x 3.50 cm / 3.54 x 2.76 x 1.38 inches Package Contents: 1 x Earphones, 1 x USB Cable, 4 x Earbud, 1 x English User Manual