3 months' free replacement & 1 year warranty.
IP68 WATERPROOF SOLAR CHARGE CONTROLLER.
Why we use silver solar panel? Because black one absorb too much heat and will become very hot and reduce the efficiency of the solar panel drastically.
Can generate 20~40 Wh electricity per day. Suitable to work as a maintainer for a motorcycle battery, or as a maintainer for a car/boat battery which is less than 12v 60AH in area which has good sunshine.
If works as a battery charger, this panel can full charge a 12v 4AH battery in one sunny day.