Trickle battery charger maintainer can charge 12V batteries with the power of the sun and create 30 watts of energy Mono-crystalline silicon panel works in all daylight conditions and is weatherproof(rain drop is OK, but not completely waterproof)for added durability Works with automotive, motorcycle, tractor, boat batteries, car battery and more Built-in blocking diode to prevent reverse discharge, not only maintains the battery but also extends its usage life. Material: Monocrystalline silicon colour: black Package Contents: 1 x Solar Panel 1 x Car charger 1 x Battery charging clip 4 x Suction cupds Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.