Promate Rovex-S3 4K Ultra HD 3-Channel Dash Cam with Starvis 2 Night Vision, GPS, Dual-Band WiFi, Parking Mode, G-Sensor, Loop Recording & 3.16" IPS Screen, 512GB Support / ROVEX-S3 / ROVEX-S3 + FREE DELIVERY !

The Promate ROVEX-S3 is a three-channel dash cam recording front, cabin and rear with a Starvis 2 IMX678 sensor behind an F1.8 lens. It runs from a DC 12 to 24V supply, supports microSD cards up to 512GB, and carries built-in GPS, dual-band WiFi and a 3.16-inch IPS screen.

The front camera pairs a Starvis 2 IMX678 sensor with an F1.8 aperture lens. Aperture is the specification that decides night performance: F1.8 admits substantially more light than the F2.0 optics common on cheaper cameras, and the sensor is designed specifically to hold detail at low light levels.

Used as a single front channel, the Rovex-S3 records at 5K, 4K or 2K. Resolution is what makes a number plate readable from a following distance rather than merely visible, which is the entire purpose of a dash cam when an incident actually needs to be proved rather than just remembered.

With two cameras connected, the S3 records 4K plus 1K or 2K plus 1K. With all three running, it records 4K plus 1K plus 1K, or 2K plus 1K plus 1K. The front channel keeps the highest resolution in every combination, since that is where the detail is needed most.

The camera runs dual-band WiFi covering both 2.4GHz and 5GHz. The 5GHz band is the one that matters here, because pulling a 4K clip off the camera onto a phone at the roadside is a large transfer, and doing it on the slower band turns a quick job into a long wait.

GPS is built into the camera, recording position and speed alongside the video. That turns footage into a timestamped record with corroborating location data, which is a materially stronger account of an incident than pictures alone, and it also lets you replay a route afterwards rather than reconstructing it from memory.

A built-in three-axis accelerometer detects impacts and immediately locks the current video so loop recording cannot overwrite it. Combined with parking mode, that covers the vehicle when nobody is in it, which is when a car is most likely to be hit by someone who does not stop.

The camera has a 3.16-inch IPS display running at 376 x 960. An IPS panel holds its colour and contrast when viewed from an angle, which matters on a screen mounted to a windscreen and read from the driver's seat rather than square on. Setup and playback happen on the device itself.

The S3 accepts microSD cards up to 512GB, recording MP4 video in either H.264 or H.265 and stills as JPEG. H.265 roughly halves the file size at the same quality, so a 512GB card holds far more footage before loop recording begins overwriting. Anti-flicker settings cover both 50Hz and 60Hz lighting.