Nature Power Monocrystalline Solar Panels take the sun's energy and turns it into electric current. These solar panels are high efficiency 12-Volt solar panels featuring sturdy aluminum frames and high transparency tempered glass tops. They have a scratch resistant and anti-reflective coating to help keep the solar panel in good shape for many years. They are rugged enough to be permanently mounted outdoors or even on mobile applications such as RVs and boats. The entire module is sealed against moisture. Designed for use with Nature Power 8 Amp Solar Charge Controller or Nature Power 28 Amp Solar Charge Controller. Installation time is minimal thanks to plug and play connections and included flat mounting hardware. Nature Power Monocrystalline Solar Panels are warranted to retain at least 80-percent efficiency up to 25 years.