This wireless PA system is perfect for events where you need to move around with your microphone and retain the same quality sound you expect from a wired amp. It comes with a wireless mic that operates at a distance up to 100 feet. The amp is compact and lightweight for easy portability. It runs on a rechargeable battery, so you don't need to keep buying new batteries - simply plug in with the included AC adaptor and charge. Adjust the sound to your liking with the treble and bass controls. This amp even includes an echo knob for a wicked sounding voice effect. There's also a ¼' jack input to plug in a wired mic. The wireless mic required one 9V battery is included. IMPORTANT NOTE: This model does not come with a wired Microphone, if the microphone is held close to the speaker where the speaker is re-broadcasted on the microphone it will cause a bad continuous effect. This unit has a built in FM antenna, so it will only pick up radio stations that have a strong frequency strength.