1Solar charger solar cell efficiency up to 20%, dual output voltage 18V5V, power is 20W 2Very suitable for battery maintenance for cars, motorcycles, boats, s, campers, greenhouses, and home charging, useful and practical 3Solar panel using waterproof design, IP65 level, portable and light, easy to carry 4Adjustable mounting bracket with adjustable solar panel angle, absorb as much sunlight as possible and generate more electricity 5The drilling holes on the panel bracket are used for quick installation and fixation, suitable for any place parallel to the ground or perpendicular to the floor, easy to install Item Type: Flexible Solar Panel Kit Type: Laminated module Interface: USB + DC interface Power: 20watts (W) Working Current: 1.1(A) Working Voltage: 18 (V) System Voltage: 20 (V) Open Circuit Voltage: 20 (V) Short Circuit Current: 1.3 (A) Working Voltage: 5V (0.2V) Short Circuit Current: 1.15A Temperature Coefficient: 0.05% Voltage Temperature Coefficient: -0.33% Module Power Temperature Coefficient: -0.23% Component Operating Temperature Coefficient: 45 (5) Output Voltage: 18V 1.1A and 5V 2A Waterproof Rating: IP65 Solar Panel Size: Approx. 420 x 280 x 3mm / 16.5 x 11 x 0.1in 1 x Solar Panel 4 x Suction Cup 2 x Hook 1 x Charging Cable 1 x Battery Cable Clamp 1. This unit is not applicable when your vehicle battery is dead. As a solar battery maintainer, the solution is to charge your battery to extend its life expectancy.2. In addition, it is recommended to unplug the charger at night, in case the blocking diode cannot prevent all reverse discharges.