I
Foreword
General
This manual introduces the installation, functions and operations of the 2-wire hybrid indoor monitor
(hereinafter referred to as "the VTH"). Read carefully before using the device, and keep the manual
safe for future reference.
Safety Instructions
The following signal words might appear in the manual.
Indicates a medium or low potential hazard which, if not avoided,
could result in slight or moderate injury.
Indicates a potential risk which, if not avoided, could result in
property damage, data loss, reductions in performance, or
unpredictable results.
About the Manual
● The manual is for reference only. Slight dierences might be found between the manual and the
product.
● We are not liable for losses incurred due to operating the product in ways that are not in
compliance with the manual.
● The manual will be updated according to the latest laws and regulations of related jurisdictions.
For detailed information, see the paper user’s manual, use our CD-ROM, scan the QR code or visit
our ocial website. The manual is for reference only. Slight dierences might be found between
the electronic version and the paper version.
● All designs and software are subject to change without prior written notice. Product updates
might result in some dierences appearing between the actual product and the manual. Please
contact customer service for the latest program and supplementary documentation.
● There might be errors in the print or deviations in the description of the functions, operations and
technical data. If there is any doubt or dispute, we reserve the right of nal explanation.
● Upgrade the reader software or try other mainstream reader software if the manual (in PDF