The 6-Watt SolarPulse SP-5 charger combines ReNew-IT Pulse Technology ® with an exceptional charging system. ReNew-It Technology safely prevents the main cause of battery problems and failure: sulfation buildup on lead-acid battery plates. Used extensively by the consumers and the U.S. Military worldwide for over ten years, this technology has been scientifically proven by two major universities to make batteries work harder and last longer than you ever thought possible. The 6-Watt SolarPulse is designed especially for emergency rescue and law enforcement vehicles because it has a unique rectangular solar panel designed to easily mount on any light bar! Pulse Tech makes three other SolarPulse models: 2 Watt (735X302), a 5-Watt (735X305), and a 25 Watt (735X325).