Button function in recording mode
Note:
There are four recording resolutions: front 2160P, front 1440P, front 2160+ rear 1080P, front 1440P + rear 1080P. When installing the rear camera, the default resolution is front 1440 + rear 1080P. If you set the front 2160P and front 1440P, you can display and switch the screen of the rear camera, but only the data of the front camera is recorded.
Photo Mode
Press and hold the M button in video recording mode to switch to photo mode. (If recording is in progress, you need to stop recording)
https://manuals.plus/redtiger/redtiger-4k-dual-dash-cam-built-in-wifi-gps-front-4k-2-5k-and-rear-complete-features-owners-manual#ixzz7qbsehal3