The PT-U36 Universal Charger from Power2000 is compatible with most 3-4V batteries. It has an adjustable, 360° rotating battery clamp that accommodates a variety of battery sizes. Additionally, the PT-U36 features a USB charging port. An LED indicates charging status: red means the battery is being charged and green means it's finished. The charger has a flip-out, 2-prong US plug that goes directly into a power outlet, so there is no cord. It runs on 110-240VAC power, enabling use all over the world, and includes a European adapter plug.