Widex P38 - Manual (Page 9)

9
Note: The magnetic field in some telephones is inad-
equate, in which case the “M” position should be used.
“MT” (microphone + telecoil): If you want to listen
both via the microphone and the telecoil, place the
switch in mid-position “MT” (e.g. when watching TV
while still wanting to hear the doorbell, telephone, or
other persons speaking).