The UltraFire 3.6/3.7V battery charger can charge 2 PCS 3.6V batteries or 2 PCS 3.7V batteries or 1 piece 3.6V and 1 piece 3.7V battery. The charger has two separate charger channels and is auto-off as batteries are fully charged. With the charger you can save a lot of money and make a great contribution to the environment. This is a necessary battery charger for your devices using the 3.6V / 3.7V battery. Charges all 3.6/3.7V lithium batteries (such as 18650 and CR123A *) Charge single or two batteries at a time Two separate charging channels - batteries can be mix-charged Auto-off when batteries are fully charged UltraFire Model: WF-139