Awei AK4 Waterproof Bluetooth Wireless In-ear Sport Magnetic Earphone with Microphone Line ControlFeatures:

Bluetooth 4.1 wireless conncetion up to 10 meters
In-ear with earhooks design, never drop out during sports
IPX4 waterproof, no fear of rain or sweat when doing outdoor sports
Magnetic earphone, easy to keep it on your neck when you do not use it
Frequency Response Range: 20-20000Hz
Sensitivity: 92±3dB
Resistance: 16Ω
Driver Size: 6mm
Line Length: 0.6m

Package Included:

1 x Awei AK4 Earphone
1 x USB Cable
1 x Clip
2 x Earhook
4 x Earbud
1 x Bag