WATER RESISTANT !! Shock & Vibration Resistant Lightweight - LESS THAN 4 POUNDS! Microprocessor Controlled, BTP Technology Charges both flooded & sealed maintenance free lead acid batteries. Charges any size (capacity) lead acid battery. Reverse Polarity Protection (VIA EXTERNAL IN-LINE FUSE). Complete FOUR-Step Charging Program (Initialization, Bulk, Absorption, & Float / Maintenance). Listed in the California Appliance Efficiency Database 2 Year Warranty