This 2‑Pin DC power adapter/charger is designed to supply stable power to compatible electronic devices that use a 2‑pin round DC input/output. It features clearly marked OUT and IN ports, making it suitable as a replacement adapter for supported equipment such as small home electronics, networking devices, audio devices, and other DC-powered gadgets (as per matching voltage/amp rating). (Please match the exact voltage (V), current (A) and polarity before use.)