This Philips stereo street buskers sound system has an output of 100w & has a 12v 100w stereo amplifier & a special microphone pre-amp or you can use the aux input for MP3/CD etc. The whole system compacts down & is easy to transport, all you need is a 12v sealed rechargeable battery & a good quality microphone & you are up & running. I have included a mic as a starter-but a better mic is needed. This is all working 100% & is in unmarked condition. PS - one small 12v rechargeable battery will give you 10 hours of continuous use.