CAMTOA 12V 5W Portable Solar Car Boat Power Solar Panel Battery Charger Maintainer for Automobile Motorcycle Tractor Boat Batteries Solar Panel: Mono-crystallinesilicon 12V 5W Power: 5 watt Load Voltage:12V Output current: 400mAh (max) Use to Charge 12-volt batteries and creates 5 watts of energy Works with automobile, motorcycle, tractor, boat batteries and more Built-in blocking diode to prevent reverse discharge Product Dimensions: 323x128x4mm/12.7*5*0.2inch No-load voltage: 18-23VDC