Countryman E6IOW6L2AT for use with Audio Technica: T27, T31, T51, T200, T201, T210, T300, T310, 1100 Series as well as the 1400, 2000, 3000 Series, The E6IOW6L2AT sku# breakdown is as follows....(E6) Earset mic, (I) Very flexible boom, (O) Omnidirectional, (W6) For speaking and vocals, (L) Light Beige, (2) 2mm Duramax aramid-reinforced cable. The low-profile E6 provides natural sound with exceptional isolation from noise and feedback. Cables quickly and securely snap into the E6/E6i earset to link the mic to the wireless system.