BT-4, Large Earcones For Use With ET-4 (Bag of Five) The Telex BT-4 is a bag of 5 large plastic earcones in a clear finish, designed for use with the Telex ET-4 coiled acoustic assistive listening and personal monitoring eartube.

BT-4, Large Earcones For Use With ET-4 (Bag of Five) The Telex BT-4 is a bag of 5 large plastic earcones in a clear finish, designed for use with the Telex ET-4 coiled acoustic assistive listening and personal monitoring eartube.

BT4$18.07