Features:
1. The built-in high-quality sound chip provides you with the crystal clear high & low frequencies. Two interconnection pieces are creating great stereo and excellent bass surrounding sound.
2. You can get 3 hours continuous work time. 2 headphones can be fingerprinted for easier operation.
3. They instantly connect to your Smartphones, tablets and other devices. Just power them on, hold near your device and start getting lost in your music.
4. Earphone design can be perfect for sports, jogging & gym exercise, watching television, or sleep.
5. Deep waterproof and sweatproof, you can run in the rain while wearing headphones.

Specification:
Talk time: about 3-4H
Listening to the song time: about 3-4H
Battery type: 3.7V, 50mAH
Input current: 5V 1000mA
Input headphone current: 5V 100mA
Mobile power output current: 5V 1000mA
Charging battery capacity: 4000mAh