Extremely flexible and easily adjust to fit over the ear of any user * High quality voice/sound pickup & Ultralight weight * *** NOT COMPATIBLE WITH: T35, T75, T211, T601, T701, 1000 Series, 1200 Series, 4000 Series, 5000 Series, 7000 Series * Suggest Use With: Sweat-proof medical tape to secure the microphone position and make it stay close to the cheek of users * Compatible with Audio-Technica transmitters: T27, T31, T51, T200, T201, T210, T300, T310, 1100 Series, 1400 Series, 2000 Series, 3000 Series