CAR BATTERY MAINTAINER: output voltage of 18V and 18 watts of energy; perfect for maintaining batteries of automobile, motorcycle, tractors or snowmobile
18W SUNPOWER SOLAR PANEL: made of premium quality SunPower solar panel with high solar cell efficiency of 22.5%; 18W output works better than 4.5W, 7W of other similar products
BUILT-IN BLOCKING DIODE: prevent your batteries from discharging backwards through your solar panels at night when charger's voltage is lower
PORTABLE & DURABLE: weighs only 345g/ 12.49oz for easy transport; made of water resistant and heat resistant material; designed for long term use
CHARGE VIA CIGARETTE LIGHTER PLUG: no need to open the car hood, you can charge the car battery directly using cigarette lighter plug. 18-month warranty and friendly customer service.