NEC NHD-3000PVR - Manual (Page 12)

10 Controls
Battery Installation for Remote Control 04
Remove the battery cover and install batteries like the diagram below.
1. Unlatch the battery compartment cover on the back
of remote control.
2. Insert 2 AAA batteries as shown, making sure
the + and - ends of each battery line up with
the corresponding marks in the battery
compartment.
3. Snap the cover back to the remote control.