Specification: Color: black Material: Polysilicon Maximum power: 5.5 (W) Open circuit voltage: 13.5 (V) Working voltage: 12 (V) Short circuit current: 0.5 (A) Working current: 0-0.35 (A) Interface: Positive negative pole clamp Function: Outdoor emergency charging Product size: 21 * 16.5 * 0.8cm Feature: 1.Charging for your car battery, notebook computer or other 12V rechargeable battery designed with the solar power. 2., environmental and safe. 3.Great for outdoor work or travel or camping training. Note: 1. Be sure to note when using the product is negative and the positive must be consistent with the charging products 2. If no professionals, please do not go trying to change the product 3. The products are used to trickle charge the car battery, it is mainly used to supplement the power that loss by the car battery self-discharge, so you can always start the car. Do not try to to no battery charging or charge the battery itself is shortage. Package Contents: 1 * solar panel 1 *