GreeSonic SunPower Semi Flexible Solar Panel 50W (ETFE+Fiberglass) Photovoltaic Solar Panel (Corrosion-resistant) with MC4 connectors Brand Solar Cell: GreeSonic utilizes SunPower Solar Cell with a higher-than-average 21.5% efficiency Flexible panels : the panel can be gently flexed to follow a smooth curve of 10 degrees max, and can be mounted on a coach roof, boat, cabin, tent, or any other irregular surface Superior Durability : the water resistant semi-flexible solar panel is ultra durable and ideal for on yacht, boat and so on, tight spaces Powerful and Lightweight: this solar panel packs 50W of power yet is only 2.5mm thick , making it easier to transport, hang, and remove Easy Installation: unique frameless design features 4 metal reinforced mounting holes at each corner for fixing screws and for easy installation