The Turnigy E3 Compact LiPoly charger is a very simple to use charger for 2S and 3S battery packs. No need for additional power supplies or 12v batterys as this little unit has its own built in power supply that is quite happy on mains power from 100v to 240v (this particular unit comes with a US plug and lead).<br/><br/>The Turnigy E3 is very easy to use, simply plug it into the mains power and all the LEDs will light green and then flash to red to indicate the charger is ready. Connect the balance lead of your battery to the balance port of the charger, after 2 secs the charger detects the voltage of the battery and starts charging. When the charger starts charging the LEDs will glow constant red, if the battery is a 2 cell then the cell LED indicators 1 and 2 will glow constantly, if it is a 3 cell then the  cell 3 LED indicator will also glow. When a cell is completely charged the corresponding LED will turn green, when all cells turn green the battery is fully charged, disconnect the battery before switching off the charger.<br/><br/>Features:<br/>• Built in power supply<br/>• 100~240V Compatible<br/>• Automatic charge start<br/>• Simple, reliable and safe to use<br/><br/>Specs:<br/>AC Input: 100~240V, 50~60Hz<br/>Battery Type: LiPoly<br/>Cell Count: 2~3 Cells<br/>Charge Current: 1.2A Max<br/>Cell Cut Off Voltage: 4.2V ± 0.02V<br/>Circuit Power: 11W ± 10%<br/>Dimensions: 88x57x35mm<br/>Weight: 103g<br/>Plug: US 2 Pin Plug<br/><br/>Conformity Declaration:<br/>This charger conforms to the EC and FCC regulations and has been tested to meet all the necessary technical standards.