This is a universal lithium-ion (li-on) smart charger. You can slide the contact points to fit almost any li-on battery. It has auto polarity, so you don't have to worry which side is the positive and which is negative. The LED light will change color when the battery is fully charged. I like to buy extra batteries for my smart phone, then use this to keep them charged while I use my phone with a different battery. The bottom part is spring loaded and rotates to fit a large variety of battery types. It also has a USB port on the side, so you can also charge your electronic devices with USB cord chargers!

• AC Input: 100~240V 50/60Hz 0.1A (Max)
• Charger Output: DC 4.2V/400mA
• Dimensions: 3.82 in x 2.17 in x 0.87 in (9.7 cm x 5.5 cm x 2.2 cm)
• Weight: 2.36 oz (67 g)