Talos Security VDPLCD7 Quick Manual page 5

When indoor monitor at working status (it is, the screen
being on), press rings selection button **, the melody music
will sound. And there're different ring type after pressing,
then choose your favorite one.
View the saved pictures (Only for the recording function models)*
Turn on the screen, then repeated pressing monitor button to
see the saved photos. To view the prior photo, please press
the monitor button continuously.