Listen LA-166 Personal Neck Hearing Loop, Dark Grey, 2W Max Power Input, 75mW Rated Power Input, Frequency Response 20 Hz - 20 kHz, Impedance 12 ohm +/- 15% @ 1 kHz, 3.5 mm Stereo Connector Compatible with any telecoil-equipped hearing aid or cochlear implant Works with any of Listen Technologies' receivers for an integrated listening solution Lightweight for comfort and convenience