Specification:solar panel:Composite standard: 3.33Voc: 20VMaximum voltage: 5VPower: 40WMaximum power: 2AOutput: 5V/Size: 540*280*2.5mmWaterproof grade: IP65Conversion rate: 19.6-20%Number of USB Ports: SingleMaterial: Monocrystalline silicon batteryFeatures:solar panelConversion rate 23-24%,Solar panels are available for surface mountingEasy to install and installFeatures:For charging mobile phones, MP3s, pads or other USB charging devices.Dual USB female interface, easy to charge the device via USB charging cable.You can place the panel in sunlight and use it to charge the device directly.Perfect for outdoor cycling, climbing, hiking, camping, traveling, etc.Scope of application: cycling, mountaineering, hiking, camping, tourism, etc.Package Included:Solar panel plus 20A controller