This is a compact unit that can switch between 6V & 12V and provides a max 6A, which should ensure a fairly fast charge time. There is no On/Off switch so make sure you connect the charger to the battery before switching the charger on, full instructions are included. There are 6 LEDs which extinguish as the battery gains more charge. The leads are fairly long and overall the item is of good quality. The specifications indicate that the unit has overcharge and short circuit protection but I can't vouch for that. The unit has a built in carry handle, though it would have benefited from some sort of cable storage (hence 4 stars). It's been a great help to me during the winter and well worth having in the garage.