Battery Doctor's Amorphous 40 Watt Solar Charger Kit includes: (2) 20 Watt Solar Panels (Part #23145), (1) 4-In-1 Adapter (Part #23129) and (1) 10 Amp Solar Controller (Part #23122). Amorphous panels and kits work in all daylight conditions helping you to harness the sun's energy! Water resistant, shock and rust resistant. Converts daylight into electricity to charge 12 Volt batteries and extend battery life. Plastic corner sleeves prevent scratching and built-in blocking diode prevents reverse charging. Includes: E-Z Connect Adapter for Plug and Play installation, mounting holes in each corner and a bright LED current indicator at the top of the solar panel. Use with Deep Cycle, AGM, Lead-Acid and Gel-Cell 12 Volt batteries.