Thank you for viewing. This is a rechargeable battery-integrated (using the included 15V adapter) amplifier that can also be used in power supply mode with a separately sold 12V adapter. Currently, the battery is likely dead, and it cannot be charged and driven. Only the power supply mode, like a regular amplifier, has been tested and confirmed to produce sound. Sound output in power supply mode is possible, but the 12V adapter for power supply is not included, so please prepare your own. If you want to use it in charging mode, the internal battery is old and needs to be replaced. Replacement is easy, and you can find instructions by searching the web. It seems you can purchase one for 2000-4000 yen from Soundhouse or Amazon. The 15V adapter for charging is included. Pick-up in Setagaya-ku, Tokyo is also welcome. Please feel free to comment if you have any questions. Compact CRATE TX50D guitar microphone amplifier with echo and reverb functions. - Brand: CRATE - Model: TX50D - Connections: XLR, 1/4 inch jack - Controls: Volume, Tone, Echo, Reverb - Power: AC adapter included - Exterior color: Black - Size: Compact