Compatibility first
A329T / A329TW systems supporting RTC420.
Viofo Telephoto Camera accessory.
£82.95
A 2K HDR telephoto camera for A329T / A329TW, using 4× optical zoom and Sony STARVIS 2 imaging for a tighter long-range view.

A329T / A329TW systems supporting RTC420.
RTC420 is the dedicated telephoto module for A329T/A329TW, using a Sony STARVIS 2 IMX675 sensor to record full 2K HDR through a narrow optical-zoom lens.
The physical 4× zoom lens concentrates the full 2K sensor resolution on a narrower corridor ahead, making distant number plates, vehicle markings and road signs larger in-frame.

The narrow telephoto view complements the wide front camera rather than replacing it. The module mounts on the front windscreen, normally near or below the rear-view mirror, and connects through the A329T telephoto port.

VIOFO's official guide covers secondary-camera rotation and windshield installation.
No. This is a secondary camera module designed to connect to the compatible VIOFO main dash cam.
Do not assume so. Secondary-camera protocols and cabling differ between product families. Match the exact compatibility stated on this page.
Only models explicitly described as IP67 waterproof are intended for external mounting. Interior/rear-window and cabin modules should remain inside the vehicle.

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