CTEK (56-959) MUS 4.3 TEST&CHARGE 12 Volt Fully Automatic Charger and Tester Fully automatic 8 step patented program tests battery condition and revives, charges and maintains to ensure maximum battery life and performance Three simple to perform test programs to establish condition and performance of battery and vehicle charging system Very simple plug and play operation, just select the program along with mode and let the charger do the rest Unique patented system to recover, charge and maintain all lead-acid battery types to maximize performance and extend battery life Safe for vehicle electrical systems through exceptionally clean voltage and current delivery with no surges, spikes or sparks