Workman DM502B (Laantek DTM502) Power Base AM/SSB 6 Pin Ranger RCI amplified desk Microphone with flexible goose neck head On Air Red LED, LOCK Button Up / Dn Button's that operate the same as radio buttons when wired for radio w-Up/Dn features. Internal Gain Control (w/ adjustment access thru access hole in base of microphone) MODE (FM/OFF/SSB Switch) Size: 6.8" (L) x 4" (W) x 12" (H)