Canon VB-M40 - Manual (Page 16)

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