Features: 1.High Efficiency: Solar panel can efficiently convert solar energy, has high charging efficiency, and achieves optimal charging in a limited space. 2.Long Lifespan: The panel is made of highly efficient monocrystalline silicon, which generates more electricity in full sunlight, prevents weathering and wear, and has a long service life. 3.Stable Suction Cup: The kit includes 4pcs suction cups, which can play a better fixing role to prevent outdoor solar panel from loosening and falling. 4.Security Protection: The panel provides multiple protection, such as overcharge protection, overdischarge protection, short circuit protection, overload protection, reverse connection protection, etc. 5.Wide Application: Widely used in batteries for motorcycles, boat, tractor, trailer, truck, RV etc. Also be used for gate openers, electric fences, chicken coops, sheds, mobile phone, power bank,and lights. Specification: Item Type: Solar Battery Charger Kit Material: Monocrystalline silicon + PET + EVA + TPT shortly Solar Cell Material: High Efficiency Monocrystalline Silicon Solar Panel Power: 25W USB Output Port: 5V 2A Maximum DC Output Port: 18V 1.38A Maximum Solar Panel Working Voltage: 18V Solar Panel Open Circuit Voltage: 21.6V Package Material: PET+EVA+TPT Solar Panel Size: Approx. 470 x 280 x 3mm / 18.5 x 11 x 0.1in Characteristic: 1. Support high current fast charging 2. Integrated intelligent charging chip 3. Multiple solar panels are connected in parallel with DC5521 port to increase the output power. Product use: It can be widely used in batteries for motorcycles, boat, tractor, trailer, truck, lawn mower, RV etc. Also be used for gate openers, electric fences, chicken coops, sheds, mobile phone, power bank,and lights Note: No power storage function