Clever aid for drying the head, which was invented for CCR Liberty by Trevis Kersting. The fan is placed on the O2 sensors block (the head is placed upside down) a via a USB cable it is connected to the charger. Gentle breech of a filtrated air fast and perfectly removes condensed moisture from the hydrophobic membranes of the sensors, part of the air is directed into the inside of the head, which is after a dive dewy as well.