PowerBox Systems GmbH - We develop and produce modern, innovative and reliable power supply systems for the modeller. Certified according to DIN EN ISO Operating Instructions. Here you will find the operating instructions for our PowerBox systems devices in various languages. Dumfries Model Flying Powerbox sensor switch - Powerbox Systems Sensor Switch- The Powerbox Sensor is an electronic switch / battery backer. Install the unit in your valuable RC model Aerplane and you have a high performance power supply system which will never let you down. In additionto a means of coupling 2 batteries, the unit also offers 2. PowerBox Champion SRS, incl. Sensor Switch, LCD. $ PowerBox Champion SRS. The door sequencer function feature integral set-up assistants which make it possible to complete the essential set-up procedures in very short order.