The Electro-Voice® Models US600EL and US602FL are low impedance handheld dynamic microphones with a pushto-talk switch. The model US600EL is an omnidirectional microphone with a tailored frequency response for high articulation speech transmission under normal ambient noise conditions. The model US602FL is a bidirectional, noise-cancelling microphone designed for high articulation speech transmission in high ambient noise conditions. The microphone can be used in noisy situations where successful voice communications would otherwise be impossible. Both microphones have a high output level and great performance stability through wide extremes of temperature and humidity, making the US600EL and US602FL an excellent choice for communications. Typical applications include amateur radio, police, marine services, commercial and paging. The US602FL noise-cancelling characteristic makes it especially effective for use in public address applications where severe feedback due to microphone position in relation to loudspeakers is a problem. The US600EL and US602FL are designed for comfortable, convenient use. The functional styling, the extremely durable Polycarbonate housing and the lifetime switch assembly all result in a microphone with superior performance, capable of long-term survival in the most demanding applications.