Ultra Lightweight Beige Unidirectional Headset Microphone for Audio-Technica Wireless Transmitters_Adjustable Left / Right Boom Clear voice pick-up. Designed for speech, lecture, broadcasting, conference. Super lightweight, thin, flexible & durable frame. Mic Boom can be attached on the left or right side of headset frame Boom Length: 4.5 inches (including 1.5 inch gooseneck tip for easy adjusting mic capsule directions) ** Compatible with Audio-Technica Transmitters: T27, T31, T51, T200, T201, T210, T210a, T300, T310, T310b, T1801, T801, 1100 Series, 1400 Series, 2000 Series, 3000 Series *** NOT COMPATIBLE WITH: T35, T75, T211, T601, T701, T1000a, T1001, 1000 Series, 1200 Series, 4000 Series, 5000 Series, 7000 Series (The mic may not be compatible with wireless transmitters of other brands, even their connectors look identical.)