Lithium-ion rechargeable battery 1200mAh.
In the use of a charger or a USB charging adapter.
A large amount of lithium has a large time for bacteria to reproduce.
TF/MMC of direct Mp3 decoder.
Compatible with different types of audio. (MP3, MP4. COMPUTER, Walkmen, Phone
Frequency Response : 45Hz-18KHz
Signal to noise ratio:50dB.
Product size: 17cm x 40cm.