Modern design with a hip and in look, it easily to bike, stroller, exercise equipment and more

1) Strap on the arm
2) Battery & DC operated
3) Battery(3?AAA;8000MAH) work up to 30 hours
4) Build-in Amplifier
5) Using the D-4N Chip with a unique NON-CLIP technology (Never Distortion) of YAMAHA
6) Stereo speaker that produces rich tones and lush bass
7) Work with any audio player with a 3.5mm jack
8) Power LED indication
9) includes a standard DC plug to power and charge
10) Easy set-up
11) one year limited warranty

Specification:
1) Length?Wide?Height=120?124?55mm
2) RMS: RMS2.1W?2;
3) Frequency Range: 80Hz-20Hz;
4) Static Current: