With this 100W Solar Blanket, you can charge the optional lithium battery in compatible Brass Monkey fridge/freezers directly from the sun. The blanket is designed to connect directly to Brass Monkey Fridge/Freezers with the built-in Lithium battery compartment and solar support. Simply lay the blanket in full sunlight on the ground, across the car bonnet or similar flat surface, and plug it directly into the fridge via the 2.1mm DC jack. Small loops around the blanket enable you to secure the blanket to avoid it being blown away in strong wind. When not in use, the blanket folds away flat for easy storage.