Automatically manage the working of solar panel and battery in solar system. Overloading & short-circuit protection.Reverse discharging & reverse-polarity protection.Under-voltage and over-charging protection. Protection from anti-thunder strike.Prolong the battery life cycle and keep the load work well. Easy to set up and operate. Suitable for small solar energy system. Colour:Black Material:plastic Rated Charge Current: 20A Due to different batches, there may be differences in product appearance and printed text, which will not affect use Package Contents: 1 * Auto Solar Charge Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.