VX SOLAR PANELs are for additional use with Ventamatic Solar Powered Gable and Roof Mount Ventilators, and are easily linked to existing panels to increase the CFMs of the fan. 12.6 watt output, high-impact tempered solar cell casings to resist hail, flying debris and impacting winds. Adding a 2nd Panel will increase output by approximately 50%. Adding a 3rd Panel will increase output by approximately 25%. The silicone crystals are encased in an anodized aluminum frame, and the 25-ft power cord has easy connect clips. The panel is covered by a 10-year limited warranty.