Three-stage constant current, constant voltage, float mode charger maintains and desulphates (conditions) your battery. Extends the performance and life of all type, size and brands of 12V batteries including maintenance-free, marine-RV deep cycle, Gel, AGM �dry� types, and �spiral wound� constructed sealed types such as Optima, Odyssey, Exide, and Interstate brands. Push-button selector for AGM, Gel and filler cap types ensures 100% compliance with all leading battery manufacturer�s specifications. Automatically dissolves power-robbing sulphation crystals using safe, low voltage, high frequency pulse technology. Manufacturer one year "unconditional guarantee" with a five year �no hassle� warranty. Additional Features: � Safely charges 70% - 200% faster than any/all known conventional constant voltage chargers. Guaranteed 100% full charge to ALL TYPE / SIZE / BRAND 12-Volt batteries, without ever overcharging them. � Full Time random sweep desulphation. � Automatically detects defective batteries and rejects them. � Auto-reset thermal breaker (protects both battery and charger under abnormal conditions such as a shorted cell and /or excessively high ambient temperatures) � Watertight enclosure with conformal coated protected circuitry � Built-in battery condition indicators: detect and displays charge level modes, charge retention and existence of sulphation. � Automatic temperature compensation w/ optional battery temperature sensor.