The Surefire Rechargeable Battery Charger Kit provides an energy dense yet economical battery solution for electronic devices that use 18650 batteries. The included smart charger only takes up to three hours to charge one or two 18650 batteries in your home, office or vehicle. AC adapter with international compatibility: Input 100-240V, 50/60Hz Smart, internal microprocessor automatically terminates when batteries are fully charged. Charger algorithm provides constant-current / constant-voltage (CC/CV) charge cycle Safety design features provide protection from over temperature, overcharge, short-circuit, and reverse polarity 12V car plug for on the road cha Mfg: Surefire