The Efest LUC S2 Charger is a dual bay li-ion charger with adjustable charging outputs (0.5A, 1.0A, 2.0A). With a USB output (5V: 1.0A), the LUC S2 can be used to charge many phones and other accessories even while charging batteries! Please note that tablets which require 2.0A cannot by charged by this charger. Features: Intelligent Li-ion battery charger. Can charge the following battery sizes: 14500/14650/16340/16650/17500/17650/18490/18500/18650/22650/25500/26650 Charging modes: 0.5A, 1A, 2A CC/CV charging method. USB output 5V (0.5A, 1.0A) Reverse polarity protection Input Voltage: AC 100-240V 50/60HZ or DC 12V Output Voltage: 4.20V+-0.05V Output current: 0.5A, 1.0A, 2.0A Includes AC wall adapter and DC car adapter. -Never leave batteries unattended while charging. -Always make sure batteries meet the specifications of the charger before use.