Audiovox AVXMTGHR1M - Manual (Page 11)

The IRT can be set to Channel A or Channel B for use with optional wireless
headphones. The default channel is Channel B. The IRT function can also be set to off.
The OSD Language feature allows the user to select the language for the on-screen
display. The user can either select English, Dutch, French, Spanish, Russian or
Chinese for the OSD language.
The RESET function allows all setting options to be reset to factory settings.
IRT
B
OSD LANGUAGE ENGLISH
RESET
11 AVXMTGHR1M