1,Novel 180 degrees of revolving design,which means ease of adjusting different angle to enjoy your music better, and also protect your speaker when the cover has been closed. 2,Why the unit deliveries a very clear ,nicety and richness sound,it is because that we adopt a twain 1 inch neodymium magnet aluminium alloy,which has strong magnetic sound to make the volume is loud ,the clarity is phenomenal. 3,Built-in Class D power amplifier ,it will play 25 hours continuously when used with 4*AAA batteries.The unit also comes with a USB cable,so you can hook it up to your PC or laptop and play your tunes.You will not be worry about the battery would gone when you are On Tour. 4,The 3.5 mm stereo plug connects directly to the speaker of all MP3.,MP4,CD portable Audio player,laptop computer as well as all iPods. There are 3 ways to give power that will make you easy to enjoy your music anywhere ( Internal 4*AAA Alkali batteries, External from your computer's USB Port and externally using DC 5V AC/DC Adapter.)