Specifications: - Material: Single Crystal Silicon Solar Panels- Power: 4.5W- Empty Load Voltage: 18-23V- Load Voltage: 12V- Output Current: Up to more than the standard light source 10000LUX 250mA- Size: Approx. 32 x 12 x 0.5 cm/ 12.60 x 4.72 x 0.20"  Features: в—Џ Backflow protection and works better for a long time use.в—Џ With a 5V USB output port to power up mobile phones and other 5V charging digital products like MP4, PSP, DV, DC etc.в—Џ Lightweight, environmental and safe, easy to useв—Џ Two elastic straps of the back of the product, convenient to set in the sun visor, you can sunshade and charge the car battery at the same time.в—Џ Perfect for outdoor work, travel or camping trainingв—Џ The cigarette lighter plug & battery clip wire are with the current anti reflux function. No need to worry about the current reflux. Just leave it there and keep it charging.в—Џ The battery panel is shock-proof, rust-proof and dust-proof.в—Џ Widely using, not only can be used on cars, but also used on campers, yachts, motorcycles with 12V battery.в—ЏThe best working hours for the product is 9:00 am to 17:00 pm (mainly for sunny days). Tips: When the weather is fine and there is no sunshine, after you power off your car, you can still listen to the radio because of the electricity provided by this panel battery. If there is sunshine, it works better.  Package included: - 1 x Solar Panel- 1 x Cigarette Lighter Plug- 2 x Suckers- 1 x USB Cable- 1 x Alligator Clip Cable- 1 x English Manual