The SHURE's 514B is a low-impedance omnidirectional paging microphone with a push-to-talk button. For usage in industrial and commercial applications such as dispatch, police enforcement, construction, forestry, transportation, and mobile public address, the microphone is built with a rugged, high-impact casing. The 514B accepts microphone inputs with resistances ranging from 19 to 300 ohms. It can be utilised in situations where extended cable lengths are required or when there is a lot of hum noise. Three mounting clips come with the microphone, and the coiled cable has four conductor lead wires for connecting the microphone to the switching relay.