70mai Dash Cam A500S 2.7K Ultra Full HD Dual-channel Optional

The possible reasons are as follows:
1) This Dash Cam has a self-protection function. When the temperature is detected to be too high, it will not respond to the power-on action, please use it after the temperature is normal.
2) Please check whether the vehicle charger and power cord are abnormal.
3) After the vehicle is auto-off when no movement, you need to manually press the power button to turn on the Dash Cam when you start the vehicle next time.

The application of the supercapacitor is the combined use of button batteries and the supercapacitors. The supercapacitor itself can store very little power. It will shut down immediately after power cut, risking the possibility that critical footages cannot finish recording in extreme conditions.
The application of the lithium battery is using lithium batteries as a backup power source. Even when the power is cut off, the dash cam will still be able to finish recording the emergency video. The drawback is that lithium batteries do not discharge well under extremely high or low temperatures.
We believe that the priority of the dash cam is capturing footage even in extreme conditions, so we chose the lithium battery solution and equipped it with precise safety protection logic. However, based on extensive user feedback, 70mai will explore the supercapacitor solution in future products.

The principle of HDR realization determines that under the setting of HDR+30fps, the frame encoding calculation is equivalent to 60fps; If HDR and 60fps are turned on at the same time, the main control encoding processing capacity of mainstream Dash Cam is insufficient, therefore the two cannot be turned on concurrently.

This model of Dash Cam has hardware-level HDR capability, which can greatly optimize the imaging effect of the following scenes with strong contrast between light and dark:
 - Access to tunnels and underground garages during the sunny day;
- Direct headlights on license plates at night; - Shadow imaging of road objects in areas with strong sunlight.

Parking surveillance, time-lapse photography and motion detection are the corresponding working modes of this model of Dash Cam for different parking security scenarios. The Dash Cam supports the following functions alone or all enabled after detecting the vehicle flameout, to guard your vehicle in all aspects:
1) Collision detection: The Dash Cam will be in standby mode without recording after flameout, but when the built-in gravity sensor (G-sensor) detects abnormal vibration of the vehicle (usually the vehicle is collided), it triggers the recording of a 30-second-long parking surveillance video, and stores it in the parking surveillance video folder of the device album.
2) Motion detection: The Dash Cam will be in standby mode without recording when flameout. When the image algorithm running continuously on the Dash Cam detects a threatening scene to the vehicle and determines that the threat level has reached the level that needs to be recorded, it will trigger the recording of a 30-second-long parking surveillance video and store it in the parking surveillance video folder of the device album.
3) Time-lapse photography: When this function is turned on, the Dash Cam continuously shoots frames at a sampling rate of one frame per second (when the video recording frame rate is set to 30 fps) or one frame every 500 milliseconds (when the video recording frame rate is set to 60 fps) when the after flameout, and then combines them into a 30 fps or 60 fps video file, i.e. time-lapse photography video, and stores it in the time-lapse photography video folder of the device album. Time-lapse photography can continuously record the situation in the field of view of the Dash Cam, and playback the video at a speed equivalent to thirty times the real-world time flow, in case there is an abnormal event, it can well record the entire cause and effect as proof of evidence.