This is a 4-in-1 multifunction Bluetooth speaker. You can use it as a surround sound system with your home theater set or you are simply use it as a personal stereo system to enjoy the music you love. It is easy to operate and economical cutting edge product. Below is some function scenario: 1.Stereo system: All you need to do is connect the unit to powerthen you can stream any music from your mobile phone via Bluetooth. The quality of sound produced can save you from using amplifier or other equipment. 2.Home Theater: Connect to power and you can play any videos from your mobile or pad and use A7 as a full home theater set. There is no need to use any more amplifier or player. 3.Karaoke set: Easy to move around from different places. Once connect to power source you and with a mic any place can be turned into a Karaoke house. 4.PC upgrade: Through Bluetooth connection you can upgrade your personal computer system to a great entertainment system. It will no longer be just some loud and noisy speaker sound.