This amplifier is awesome! It sounds really good and is very loud! It is great because it is rechargeable and does not need batteries, plus holds a charge for about 10 hours! This amplifier will also take a memory card and supports a usb device for music or recorded direction. What more could anybody want? The price is great and the device works so well that I would of expected it to be more expensive. This is one of the best items that I have ever ordered.