When we are travelling or camping in the outdoors, running out of battery is a very annoying thing. But if you have this DIY Solar Panel, you completely don't have to worry about that.Features:Polycrystalline silicon solar panel, stable and high efficiency.The solar cell is used for DIY charger by absorbing solar energy.It can multiple series or parallel to produce electricity.Portable size makes it easy and more convenient to use.Specifications:Max. Power: 2W / 3W / 4.2W / 5.2W(Optional)Color: BlackMaterial: Polycrystalline SiliconWorking Voltage: 12VOpen-circuit Voltage: 13.5VWorking Current: 2W: 0-160mA; 3W: 0-250mA; 4.2W: 0-350mA; 5.2W: 0-430mAShort-circuit Current: 2W: 200mA; 3W: 300mA; 4.2W: 500mA; 5.2W: 650mAProduct Size: 2W: 136*110mm; 3W: 145*145mm; 4.2W: 200*130mm; 5.2W: 210*165mmProduct Weight: 2W: 56g; 3W: 85g; 4.2W: 98g; 5.2W: 135gPackage Size: 2W: 15.5*13.5*0.5cm; 3W/4.2W: 22.5*15.5*0.5cm; 5.2W: 24*20*0.5cmPackage Weight: 64g-146gPackage List:1 * Solar Panel