Universal Battery Charger for 3.7v Cell Phone Compatible with the following devices: Built small batteries found in cameras, camcorders, PDA and cell phones. Compatible: The adjustable contacts work any 2.8V - 5.9V (usually rated as 3.6 or 3.7 volt) battery whose contacts are less than 1 1/2" apart. Compact: AC prongs fold into casing to easily fit your glove box purse. Convenient: Instead of taking bulky charger on road use this instead. USB port side so you can plug charging cables. Please Note: ONLY meant charge between 5.9V. DO NOT use voltage ratings more may damage battery.