Efest LUC V4 Battery Charger features a beautiful 4 slot charger that allows you to charge two batteries at once, independent of each other. The brightly lit LCD screen offers information about your batteries, all while protecting against over-current, short-circuiting, reverse polarity, and a nifty zero voltage activation function. Best of all, it monitors the charging batteries and chirps an alarm should any problem arise. Some other uses for the LUC V4 charger include charging cell phones, iPads, MP3 & Mp4 players, PSP, etc, using the 2 USB sockets of DC5V/0.5A and DC5V/1A. Simply slide a fully charged battery into channel 2, disconnect the AC wall plug, and hold the rectangle button for 2 seconds Compatible batteries include the following Li-ion batteries: 10440/14500/14650/16340/16650/17650/17670/18350/18490/18500/18650/2070/22650/26500/26650 Product Specifications: Input voltage: DC 12-24V Output voltage: 4.1 ??1% 500mA CC current: > 450mA 1000mAh CC current: > 950mA Cut-off Voltage: 4.2V ?? 0.05V TC Current, 0.5-1A: ?????60-120mA Auto recharging Threshold Value voltage: 3.9V ?? 0.15mA Activation Voltage ( battery voltage < 2V): 0.45 ??0.15mA Operation Temperature: 0-40??C Storage Temperature : -40 - +70??C Product Includes: 1 Efest LUC V4 Charger 1 AC Wall Plug 1 Car Charging Cable 1 User Manual