Intended for professional use, SuperCharge 40/1 is an intelligent electronic charger suitable for all types of lead acid and low maintenance batteries. Operation of this product is perfect for the busy professional - just select the battery type and output voltage. Connect battery clips and switch on. The intelligent circuitry reads the battery condition and delivers the appropriate level of charge, indicating the charge rate on the ammeter. When fully charged, the machine switches off and will automatically turn itself on again should the battery voltage drop. This unit can be connected to a battery for an indefinite period - the intelligent circuitry maintains the batterys level of charge at its optimum level.