Eyemax TVST PVT3-04N5 User Manual page 60

9) Controller
This sets the ID of remote control. If you have many DVRs in the same place, you
can control separately the DVR by different remote control ID.
 Remote controller ID setup
Use the ID setup and number key to set the ID of remote control on the remote
controller. You may check the ID by pressing the remote control key. The ID should
be the same between the DVR and remote control.
And you can turn it on/off the key sound.
Remote Controller ID
Key Buzzer
All, 00 ~99
ON / OFF
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CH 3 How to Use