Conventional power banks for recharging smartphones and tablets are often empty just when you need them. The Voltcraft SL-80 power bank has built-in solar cells that prevent self-discharge as long as the power bank is stored in a suitable location, such as on a windowsill. The casing is protected according to IP54 standards, making it ideal for outdoor activities. In sunlight, the power bank recharges itself, free of charge and completely autonomously. Charging is faster via the integrated USB port. When the power bank is charging, a built-in LED lights up green. Once the power bank is fully charged, the LED turns blue. The power bank also features a flashlight and SOS function, ensuring you have light in the dark and can attract attention in emergencies with sufficiently bright light. Four integrated LEDs indicate the current charge status of the power bank.