This is a DC 5V/1A linear regulated power supply for audio use. The included cable (approx. 1.0m) is microUSB, compatible with devices like the CHORD Qutest. If the terminals are compatible, it can be used with devices other than microUSB. (Body side: Outer diameter 5.5mm / Inner diameter 2.5mm) If you want to use it with devices with an outer diameter of 5.5mm and an inner diameter of 2.1mm, you can search for "DC 2.5mm 2.1mm cable" on Amazon, etc., and you should find a compatible cable. *Please check if it is compatible with the product you are using. Used in a smoke-free and pet-free environment. I am selling it because I no longer use it after moving. *Search keywords Audio Design Audio Design DCA 5V *Manufacturer's description This is a high-performance DC adapter developed for audio equipment. Compared to general-purpose DC adapters and USB power supplies, it has significantly less noise and a more stable current supply, which improves sound quality when used with USB-DACs, etc. This is a 5V output model. DC Adapter DCA Series / Features ・Ultra-low impedance of 10mΩ or less ・Noise component is 2uV(A), 1/10 to 1/1000 of ordinary commercial products ・High-speed operation, so low impedance up to high frequencies ・Improves sound quality when used with various audio interfaces that use DC power ・High-quality appearance with an aluminum sash case ・PSE certified DC Adapter DCA Series / Applications Can be used as an external power supply for USB-DACs, FireWire, and other portable audio devices to improve sound quality. It has a reputation for excellent sound quality. Does a DC adapter affect sound quality? It makes a considerable difference. For example, if you replace the standard DC adapter of an Onkyo ND-S1 for iPod with this DC adapter and send a digital signal to a DA converter for playback, the bass becomes thicker, and the harshness of the mid-high frequencies is reduced. You will be surprised that it also makes a difference with digital signal processing devices.