The Uniross RC101129 Battery Charger is designed to recharge Ni-MH and Ni-Cd batteries in sizes AA, AAA, and 9V. With a capacity to charge up to 4 batteries at a time, this unit is compact and efficient for powering a variety of electronic devices. The charger operates on 1.2v and 9v voltage levels, making it versatile for different battery types. Manufactured by Uniross, known for quality battery products, this charger is a reliable and essential item for keeping your devices powered up used working ok