Step 1 Right click mouse and click main menu

Step 2 select Info.

Step 3 Clieck Version.

There is another way to check SN of system.

Step 1. Turn on DVR and connect DVR to a monitor. Right click mouse and select guide.

If you have not connected DVR to a monitor and can not log in system, there is another way to find your system's SN.

1. Plug DVR to router by ethenet cable.

2. Get a computer which is connected to same router as DVR is connected.

3. Install a software on computer. Here is sofrware. support.annke.com/document/XM/General/tool/device_manager.exe

4. Check if the software can detect system's serial number.