The only solar charge in the world that will wake up your device and continue charging during sun interrupted conditions, without the need of a battery bank. 2 x USB outputs 5v 2amp max. 3 x 3.5 watt folding high-efficiency crystalline silicon panels. Direct charging via USB voltage-stabilized output. Intelligent power management. The 10w system can adjust the current to achieve the fastest charge possible in accordance with changes in sunlight levels.