TEN-TEC model 708 is an omni-directional dynamic microphone designed for use as a communications station microphone for Amateur Radio and other transmitting applications.      The unit consists of a metal die-cast base (plastic bottom cover) with 3 position PTT switch with momentary TX, OFF, and LOCK positions, flexible metal gooseneck, dynamic microphone element and ball-type element housing.    The element has tailored frequency response from 30 Hz to 12 kHz designed for excellent transmit audio in SSB, AM, and FM modes.