Dimensions: 2.4" x 6.5" x 5.4" Unitrol full featured siren and light control. Features include the all new Unitrol slide switch, and intersection management sweep tone. Six rubberized 20 Amp push button auxiliary switches allow for an assortment of lights to be controlled from this one central unit. Five unique Unitrol siren tones that have set the standard in the industry for warning. Other great features of this siren unit include LED indicators and adjustable back-lit face plate, accessible Radio/PA adjustable volume control, low operating current with zero standby current, and quick low cost vehicle installation. Use your own microphone or add Federal's quality noise cancelling microphone.