Support GS1 Solar-cell Panel Supply power to your devices Solar Panels: Polycrystalline Working Voltage at: 5V Working Current: 2A Operating temperature: -20℃ - 60℃ (-4℉ - 140℉) Waterproof: IP67 Dimensions: 340 x 240 x 17mm ±0.5 Cell conversion efficiency: 18.5%