PS Engineering PMA8000BT - Manual (Page 19)

202-890-0702 Page 19 Jan. 2011 PMA8000BT Pilot Guide
mode. The copilot can continue to use the selected com while the pilot will
be heard over the speaker. To exit push Mute and SPR again. This mode is
also reset when power is cycled.
Backlighting
The white text backlighting is controlled by the aircraft dimmer, while the
green indication LEDs are automatically controlled by the light sensor on the
PMA8000BT.