The Guest Network is a feature of some of EnGenius indoor and outdoor
access points and EPG routers that creates a separate network for guests.
This secured network provides Internet access to guests' wireless
devices.

See related Articles below:

• How enable/disable the Guest network on EAP/ECB/ENH and EWS Access
  Points?
• Setting Up Wireless Guest Networks
• How to create a Guest SSID on an EnGenius Cloud/ IoT router?