The following picture is the outline of the "Alert Settings" panel.

Play sound notification when a customer logs in
With this feature enabled, when a customer logs in system, a sound alert would be delivered to inform of the operator or administer.

Play sound notification when a customers logs out
With this feature enabled, when a customer logs out system, a sound alert would be delivered to inform of the operator or administer.

Customer login indicator
There are three options for you to choose: None, Image and Bubble.
None: there would be no indicator appears when a customer logs in.
Image: there would be an image appears when a customer logs in like the following figure:

Bubble, there would be a bubble appears when a customer logs in:

Customer logout indicator
There are three options you can choose: None, Image and Bubble.
None: there will be no indicator appears when a customer logs out.
Image: there will be an image appears when a customer logs out:

Bubble, there will be a bubble appears when a customer logs in:

Play sound notification when a new message arrives
Provided this feature is enabled, when a new message arrives, the system would play a sound alert

Customer message indicator
There are three options for you to choose: None, Image and Bubble.
None: there will be no indicator appears when new a message arrives.
Image: there will be an image appears when a new message arrives:

Bubble, there will be a bubble appears when a new message arrives: