OPTIMATE 4 12V UNIVERSAL BATTERY CHARGER complete with tester with charge level control and LEDs. For charging, maintaining, testing and evaluating all 12V batteries (GEL batteries, MF and other maintenance-free batteries). Auto-Complete, Charging Current Control: No battery overcharge, overvoltage, or overheating. Automatic polarity check (an incorrect connection is detected immediately without consequences). 12V 0.2/0.8A 100Vac to 230Vac 50/60HZ Code: 019728 Original code: AT