Instapark® 5W High-Efficiency Mono-Crystalline Solar Panel, Color Black Type: Solar Panels Cell Type: Monocrystalline Solar Cell: Monocrystalline silicone 156x156mm Front Glass: 3.2 mm tempered glass Frame: Anodized aluminum alloy STC Optimum Operating Voltage (Vmp): 17.6V STC Open Circuit Voltage (Voc): 22.3V STC Operating Module Temperature: -40 deg C to +85 deg C