1With high conversion rate, the charger can charge 12V batteries where there is sunlight. 2The environmental friendly battery charger can maintain the battery and extend its life while charging. 3Made of premium monocrystalline silicon, the waterproof has good scratch resistance for easy cleaning. 4The light weight makes the charger easy to carry for convenient outdoor car battery charging. 5Can be bent appropriately to apply to charge the battery of automobile, motorcycle, and so on. Item Type: Solar Car Battery Charger Product Material: Monocrystalline Silicon Model: SC1820 Solar Panel Power: 18V 20W (No Load Voltage 23V) Solar Panel Output Current: Maximum 1000mA (under summer sunlight) Solar Panel Size: Approx. 360 x 330 x 12mm / 14.2 x 13 x 0.5in Applicable Battery Parameters: 12VBattery (car battery/motorcycle battery/ battery) (without battery) USB Output: DC5V Installation Method: 1. Park the car where the sun can shine;2. Fix the solar panel on the windshield (or other location), this will not affect the safety of the line of sight, and it is easy to be exposed to the sun;3. Insert the DC male end of the battery clip cable into the DC female end of the belt. Connect the red and black wires at the DC female end to the battery port in the middle of the controller. Then connect the black clamp to the negative pole of the car's battery. Connect the red wire clip to the positive terminal of the battery; 4. Then insert the DC male cable pair into the output DC female hole of the solar panel; 5. Connect the red and black DC male cables to the solar panel port on the left side of the controller. If your car pulls out the key, and the cigarette lighter port is a constant power type and the power is turned on, plug the cigarette lighter cable and solar panel directly into the cigarette lighter port of the car. Some models pull out the cars key and cigarette lighter port. You can only connect the car battery to the clip. It is recommended to insert the cigarette lighter head for charging while driving, and connect the battery to the clip for charging after the car is parked and turned off for a long time. If you want to know whether the cigarette lighter of a car is a common power supply type, the test method is as follows: Turn off the car during the , pull out the key, put the sun panel in the sun, insert the cigarette lighter plug into the cigarette lighter port of the car, and activate the radio or audio on the car at the same time. If it can be started normally, it means that the cigarette lighter of your car is of ordinary power supply type. If it fails to start, it means that the cigarette lighter of your car is not a normal power source type (the normal power source type is only suitable for short-term parking during the and charging the cigarette lighter plug or listening to radio music. It is not suitable for contacting the plug at night) 1 x Car Cigarette Lighter Charging Cable 1 x Solar Power Panel 4 x Sucker 1 x Positive And Negative Battery Clip Charging Cable 1 x Solar Controller 1 x DC Male Connector Cable 1 x DC Female Connector Cable 2 x User Manual