A low-battery message appears on the A/V monitor when the remote batteries need replacing. When replacing them, be sure to replace both batteries with new ones.
Replacing the remote control batteries
Remove the battery compartment cover and remove the old batteries
Install two new AAA (IEC-LR3) 1.5V batteries, matching the polarity markings (+ and –) to the markings inside the battery compartment
Slide the battery cover back into place