Canon VB-M40 Operation Manual page 16

Comparison of Two Viewers
The camera has two viewers. The main differences are described below.
Viewer type
VB-M40 Viewer
RM-Lite Viewer
VB-M40 Viewer Audio Reception (One-way Communication)
Microphone
(Sold separately)
Audio from the microphone connected to the camera can be listened to from the viewer speaker.
RM-Lite Viewer Audio Reception (Two-way Communication)
Microphone
(Sold separately)
Audio can be transmitted/received between the camera and viewer.
Note
PC, speaker and microphone sold separately.
1
-6
Live image display
JPEG
JPEG/H.264
VB-M40
Network
VB-M40
JPEG/H.264
Network
Audio
Speaker
(Sold separately)
Audio
Receives audio from the camera (one-way communication)
Transmits/receives audio (two-way communication)
VB-M40 Viewer
JPEG
Audio
Speaker
RM-Lite Viewer
Microphone
Speaker