Maximal Power FC18650 Rapid Dual Channel Charger for 18650 Rechargeable Li-Ion Battery with US Plug Amazon.com is the only authorized dealer selling MaximalPower brand products. Please make sure your item is ONLY sold and shipped by Amazon.com! All other marketplace vendors are selling counterfeit products that do not perform the same, and/or are not covered by our MaximalPower Warranty It charges 18650 Li-Ion rechargeable battery It has a built-in microprocessor that automatically switches off when batteries are fully charged Charger Input Voltage : AC 100-240V 50-60 Hz 500mA Max Charger Output Voltage : DC 4.2V =1A*2 1 year limited warranty