***** Best Quality Guranteed. *****High Conversion Efficiency Modules, 170 watt monocrystalline solar panel charges 12V battery *****Diodes are pre-installed in junction box, with a pair of pre-attached 3ft MC4 Cable *****Withstand high wind (2400 Pa) and snow loads (5400 Pa) & Excellent performance in low light environments *****Easy to use and mount, sophisticated to use with your RVs, boats, and other outdoor equipements ***** promise 18 months warranty and lifetime warm hearted service for you