This Warning Stick is a great solution for rear back deck lighting and can also perfect for installation on front headliners, mounting in your grill or anywhere else you would like to have slim line discreet lighting. It is a very low profile unit, which produces high intensity lighting using Generation 4 3W Linear Technology designed with an outstanding and most up to date microprocessor circuit that facilitates low power consumption. Using the state-of-the-art Gen4 3W LED technology it illuminates a powerful ray of light, which can be seen in any direction even in clear daylight. The Traffic advisor comes standard with 2″ Brackets, suction cups, ON/OFF switch on the cigarette plug as well as a sync wire, to sync more than one unit together. They have the ability to synchronize with or without the cigarette plug and can be hardwired to your own switch box as well. They are Waterproof and can be used for interior or exterior use. Additionally, it has been tested against Vibration, moisture, and corrosion.