Specification:

1. Applicable to many digital audio players like MP3, MP4, Laptop, PC, MD, Mobile phone, etc

2. Patented expansile resonator will strengthen the sub-woofer performance. When closed, it will be easy to be kept in pocket.

3. Fixed 3. 5mm audio port, any other cables are unnecessary. 4. Built-in rechargeable Li battery protected multiple circuits. The continuous working time is more than 5 hours.