This is a reliable AC to DC power adapter, also known as a Class 2 transformer or wall charger. It provides a stable DC 9V output at 100mA, making it suitable for a variety of small electronic devices. The adapter features a standard US 2-prong wall plug and a right-angle barrel connector with center-positive polarity. It is UL Listed for safety and made in China. Ideal as a replacement or backup power supply for compatible devices requiring 9V DC power.