Want to use a Satking Orbit on a truck or a bus? Then you will need this 24VDC to 12VDC downconverter. The Orbit just runs on voltages up to 15VDC but some vehicles are configured for 24VDC, if this is the case you will require this device. The unit connect between the power cables of the Orbit and you vehicles power system. Make sure you have at least 5AMPs available in you power system.