The system consists of three parts – a mobile unit (SOFT-CASE) incl. sensor (SMART-CASE XS) and a charger (COMTEC). With the mobile sensor unit, humidity measurements as well as leak checks are carried out in the interior of the vehicle. The charger serves as a communication interface between the computer and the hand-held device. Together with the data transmission, the batteries of the sensor unit are also charged by means of a USB connection.