PhatWeasel has it right...one thing to keep in mind is that the DEH-P7200 is a Pioneer unit
I would attach the manual, but why waste the space here, it's available at Pioneer. Here's the applicable text cut & pasted from the online Adobe PDF file.
About the Demo Mode
This product features two demonstration modes. One is the Reverse Demo mode, the other
is the Feature Demo mode.
Reverse Demo
If you do not perform an operation within about 30 seconds, screen indications start to
reverse, and then continue reversing every 10 seconds. Pressing button 5 when power to
this product is switched OFF while the ignition switch is set to ACC or ON cancels the
Reverse Demo mode. Pressing button 5 again to start the Reverse Mode.
Feature Demo
The Feature Demo automatically starts when power to this product is switched OFF while
the ignition switch is set to ACC or ON. Pressing button 6 during Feature Demo operation
cancels the Feature Demo mode. Pressing button 6 again to start the Feature Mode.
Remember that if the Feature Demo continues operating when the car engine is switched
OFF, it may drain battery power.
Note:
• You cannot cancel a Demo mode when the front panel is open.
• The red lead (ACC) of this product should be connected to a terminal coupled with ignition switch
ON/OFF operations. If this is not done, the vehicle battery may be drained.