Specification:1.The 5-Watt 12V Solar Car Battery Charger is the perfect solution for charging the batteries of motorcycles， automobiles， snowmobiles， tractors and more， which is not only environmental protection and energy saving， but also can maintain the battery lifetime， extending its usage life. It can also charge other 12V rechargeable batteries in emergency， suitable for vehicles in outdoor work or travel or camping training.2.Made of durable plastic and Mono-crystallinesilicon solar cells， this unit charges in all daylight conditions， even on cloudy days. Constructed with a built-in blocking diode to prevent reverse discharge， this solar panel is easy to install and completely maintenance-free. Just plug this solar charger into your vehicle's 12-volt lighter socket and position the panel to pick up the most daylight possible. Or， if you prefer， use the included alligator clips to connect it directly to the battery，Note: This solar panel can generate 1 Amp per hour under ideal conditions. For example， under ideal conditions， the panel will generate 4.5 Watts x 7 hours x 7 days per week for a total of 220 Watts of power.Key Features1.Solar Panel: Mono-crystallinesilicon 12V 5W2.Power: 5 watt3.Load Voltage:12V4.Output current: 250mAh~300mAh (max)5.Use to Charge 12-volt batteries and creates 5 watts of energy6.Works with automobile， motorcycle， tractor， boat batteries and more7.Built-in blocking diode to prevent reverse discharge8.No-load voltage: 18-23VDCInstallations:1.Put it on the work bench in front of the car dashboard， the sunlight absorbing ability of this way is not strong.2.The sunlight absorbing ability will be great if you set the two elastics at the back of the product on the sun visor of the car.3.It is better to fix the sucker in the windshield which doesn¡¯t affect the security sunlight exposure easily or other places.Package Include:1 x Car solar battery charger1 x Car charger cigarette lighter plug1 x battery charging clip line2 x suction cupds1 x Manual