This product is a subwoofer, but it has a built-in 5.1-channel AV amplifier. It has analog inputs, as well as HDMI, USB, and optical terminals, and also includes FM radio. A remote control and speakers are also included. If you have a microphone, the sound field will be automatically set (you can also set it manually from the remote control). You can experience 5.1-channel sound in a small space. One of the joys of setting up an AV amplifier, so if you're particular about this, please look for other models. We cannot guarantee the product due to its age, so please consider carefully. Power-on has been confirmed. We plan to check the sound output later, but the price reflects that only power-on has been confirmed. Thank you for your understanding. s-swr323 Immediate purchase is welcome. You can remain silent until the end. You can get a small discount if you purchase it with other products. #YuuShop