Diagnostic charger for 12V batteries from 3Ah to 50Ah. Suitable for all vehicles and for use indoors or outdoors. The cables continue to function at a temperature of 40 degrees below zero. Ready to go? The OptiMate4 tells you whether the battery is ready or further maintenance. The desulfatatieproces can save batteries that have barely 0.5V voltage. Provided that can choose the right program directly connected to the CAN bus system.