Koolatron 402333 12V 1.8W Solar Trickle Charger Keep your car battery charged and ready to start Koolatron's 12V trickle charger keeps your car's battery charged and ready to start Using just solar power, your car battery will constantly ready to use, never ask for a jump-start again! No assembly required 16 in. L x 5 in. W x 16 in. H