Perman Universal AC 110V-240V LED Dual Battery Charger for 18650 16340 26650 Rechargeable 3.7V Li-ion Battery US Plastic Plastic and Metal Material: Plastic and Metal. Color: Black. Plug: US plug Item size: 10.5 * 2.5 * 3.1cm (L * W * H). Input: AC100-240V, 47-63HZ. Output: 3.7V, 400mA. Compact, portable and multi-functional design. It can charge 2 batteries at a time. Automatically stops when charging has completed. With a LED indicator: red light stands for charging status and green light for fully charged. It's suitable for some cylindrical lithium batteries such as 18650, 14500, 16340, 10440, and 26650.