Check the listing for details. Kastar Universal Battery Charger USB-Port LCD Indicator Screen For Mobile Camera. Color: Black, Condition: New. Listed at 6.99 USD. Compatible With:Cell Phone PDA Camera Li-ion Battery/Digital cameras/Mp3 Mp4 players/Hand held gaming devices/PDAs and most rechargeable lithium-ion batteries under 4.7 voltsProduct Introductions:1. Input: AC 100 - 240V/50 - 60Hz/200mA; Output: DC4.2V -800mA(Battery) /DC5.2V-1300mA(USB)2. LCD Screen Indicator lets you know that your battery is charging, when LCD screen show 100% mean battery is full3. Built-in protection circuit prevents overcharging and heats. Quick charge with automatic constant current control protects battery from overcharging, short circuit, and electric shock4. 2 IN 1 USB Battery Charger: It can be used as not only a special charger, but also a charging plug for your deviceHow to use the Kastar Universal charger for battery?First, please take a look at your battery; there are one mark "+" positive contact and one mark "-" negative contact.Then, take a look on the Kastar charger; you can get two little movable prongs. As the positive and negative are automatically recognized by this charger,it doesn't matter which contact on positive and which contact negative.Third, pull down the bottom, and put the battery in it. Adjust the charger prongs to match the polarities of the contacts on the battery. Release the part of the charger that moves.This will lock the battery in place.LCD Screen Indicator (25%,50%,75%,100%) lets you know that your battery is charging, when LCD screen show 100% mean battery is full.Finally, plug the charger into outlet to charge it.