The Sunnybag Sunbooster is a highly efficient portable solar system with a total output of 21 watts. It is perfect for anyone who loves independence and wants to be powered up around the world. Whether hiking, climbing, touring, cycling, playing golf, camping, or at festivals - this solar charger is a reliable companion that will power your devices. Like any solar panel, the Sunnybag Sunbooster works best when positioned at a 90° angle to the sun. In full sunlight, smartphones can be charged in 2-3 hours, depending on the model. Larger devices like drones or tablets take 6-8 hours. Charging times will be extended in cloudy conditions or if the panel is not optimally oriented towards the sun. The Sunbooster can also be used to charge power banks, allowing you to store solar energy for later use. Its robust, scratch-resistant surface is unaffected by cold and moisture. The solar charger can be used in winter and wet conditions as well. With the eyelets at the corners of the panel, the Sunbooster can be easily attached to various objects such as backpacks, tents, or trees.