Voltaic Systems - Mini Solar Panel 3.5W / 6V - Silver | Panel Made with High Performance Monocrystalline Cells | Waterproof, UV and Scratch-Resistant &Eacute; OUTPUT | 3.5 Watt peak output at 6 Volts. Monocrystalline cells - 19.5% efficient ULTRA LIGHT, COMPACT DESIGN | 8.3" x 4.4" x 0.2" 5.5 oz. (156g), Mounted on an Aluminum/Plastic composite substrate (3mm) MOUNTING AND CABLES | Four screws on back corners of panel allow multiple mounting options (4-40 thread, 0.18" long [0.46cm]) TOUGH IN THE SUN - HIGH QUALITY, TESTED MATERIALS | 1 rugged monocrystalline solar panel. Waterproof, UV, and scratch-resistant designed for ten plus years of outdoor use in any condition Keep it Running Warranty | 2 year warranty on solar panels. To make sure our products last, we use rugged fabric and make strong panels that can withstand the rigors of everyday use 4-40 thread, 0.18&#034; long