Hossen 2Pcs 3.7V 18650 4200mah Protected Rechargeable Lithium Battery with 18650 battery Charger 18650 Rechargeable Li-Ion battery with IC Protection Can be used in laser pointer,Torch Flashlights and other electronic products. Designed to charge your batteries quickly and safely Input Voltage: 110-240V, 47-63Hz Function: smart charger for 18650 batteries, 18650 batteries for flashlight, headlight, laser pens, and so on.