Specification:Item Type: Solar PanelsMaterial:Monocrystalline Silicon, PET LaminateSize: Approx. 38 x 28cm / 15.0 x 11.0in (Manual Measurement Allowable Error)Solar Panel Type: Monocrystalline SiliconPower: 30wOpen Circuit Voltage (Voc): 18VMaximum System Voltage: 18VTemperature Coefficient of Isc: (010+/-0.01)%/CTemperature Coefficient of Volatile Organic Compounds: Minus (0.38+/-0.01)%/CTemperature Coefficient of Power Voc: Minus0.47%/CTemperature Range: Minus40℃ to +80℃Package List:1 x Solar Panel2 x Spare PV Connectors2 x Copper Core1 x User ManualNote:1. when charging, make sure the appearance of the solar panel is facing the sun.2. should avoid contact with impacting objects and other acute objects.3. solar panels should not be bent too much to avoid breaking.4. keep the appearance of the panel clean when charging to maintain high efficiency of solar power generation.5. When the product is not put into use, it should be folded and stored.