FeaturesNo internal batteryCharges 2 devices at the same time21 Watts SunPower® panelUSB and USB-C compatibleLCD displayThis Xtorm SolarBooster 21 Watts Solar Panel enables you to easily use solar energy to charge your devices, anywhere you go.High yieldThis SolarBooster uses high yield SunPower® cells to charge your devices extra fast. Thanks to these very efficient cells there is minimal loss of energy during the charging process, and they even function on a cloudy day! The LCD display shows the current Ampere output of the solar pane.Easy chargingMobile devices can be connected directly to the solar panel via USB and USB-C. It’s even possible to use the SolarBooster 21 Watts to charge two devices, such as a smartphone and an Xtorm power bank, at the same time. Because the SolarBooster has a high output it’s able to charge devices extra quickly.Practical designThanks to the practical design and the carabiner that’s included, the SolarBooster 21 Watts panel can be easily fixed on a backpack, tent or bicycle. When the solar panel is not in use it’s easy to fold up and take with you. The material that’s used is strong, flexible and waterproof.First-rate Solar PanelsXtorm incorporates the latest SunPower® technology, these are the best solar panels available on the consumer market.Solar efficiencyThis Xtorm Solar Booster is provided with SunPower® solar panels boasting the industry’s highest solar efficiency ensuring the least possible loss of energy during the charging process.Auto Power ManagementThe Xtorm 21 Watts Solar Charger is provided with the APM chip. This means that this Solar Booster automatically has the correct charging speed and efficiently divides the power between the attached devices.Overload protectionXtorm mobile chargers protect the battery of the attached mobile device from overcharging.Temperature controlAll Xtorm Solar Boosters are provided with a temperature control chip that prevents overheating.Auto Power ManagementThe Xtorm APM-chip automatically balances the power over the attached devices to prevent overcharging or overheating.