Ricoh CAPLIO G4 WIDE - Manual (Page 86)

Chapter 1
Section 4 Playing Back/Deleting Still
Images, Movies, and Sounds
You can display still images or movies on the LCD Monitor to check them,
and delete unwanted ones. You can also hear a recorded sound from the
speaker.
The sound-related functions (recording, playing back, and deleting) are
only available for G4wide.
It is recommended that you plug in the AC Adapter whenever viewing still images or movies on the LCD Monitor.