Designed for 6-volt and 12-volt lead-acid automotive, marine, and deep-cycle batteries. Alters the charge to eliminate over-charging in hot climates and under-charging in cold climates. Charges dead batteries as low as 0-volts in the new 'Force Mode'. Operating requirements - Line Voltage: 120V to 240V AC Frequency: 50Hz to 60Hz Operating Temperature: -4 to 104 F (-20 to 40 C) Storage Temperature: -22 to 140 F (-30 to 60 C) Relative Humidity: 0 to 95% Non-Condensing IP Rating: IP65 Consumption: 30 Watts (Max) Efficiency: 87% (120VAC/230VAC)