EasyN H3 Series User manual - Manual (Page 11)

MH3E-E-A2 - 10 -
5.3 Operations
Record: click
Snapshot: click
Listen: click ， it will change into ， then we can listen sound coming
from camera terminal on computer monitoring interface, click again to disable the
function.
Talk: click ， it will change into ， then we can talk to camera terminal via
headset on computer terminal. Click again to disable the function.