The New Nova Microdash Pre-emption traffic signaling unit is a completely self-contained unit. It offers both High and Low Priority signaling. Unlike many others that offer just one. It is fully compatible with all none coded traffic pre-emption systems. The Nova Microdash Pre-emption is a very very versitle light that can be used for dash mounted pre-emption, above the rearview mirror mounting or it can also be mounted inside of an exsisting lightbar.