Perman Universal AC 110V 220V LED Dual Battery Charger for 18650 Rechargeable 3.7V Li-ion Battery US Plastic Plastic and Metal Material: Plastic and Metal. Color: Black. Plug: US plug Input Voltage: AC 100-240V 50/60Hz. Compatible with: 18650 Li-ion Battery. Battery are not included. Output: DC4.2V,1A. Cable length: 38cm. This product is very convenient and easy to use. When you plug the 18650 battery into the charger, it will show Red LED Light, and Green means in full charging condition.