Repeater Offset:

The transmit offset can be set to a value pre-established by the owner of the IRB separately for each band from 50MHz through 1296 MHz  The offset can be toggled by the user by pressing the 'R' key. The value of the offset selected will be displayed under the main receive frequency

Tone Control

Whenever a repeater offset is selected, then the user may set a frequency for a sub-audible tone via a drop down menu visible next to the offset display.