I just picked up one of these, not because I needed it (I have a Varia RTC715) but because I wanted to see if it really worked as advertised for the $170 price tag.
Here is the description of the unit per the seller. Oddly enough, they advertise it as a "dash cam" but it really is a rearward facing tail light and camera. It mounts on your seatpost. "Mount the black Q100 1080p Bicycle Dash Cam from Ripoon on your bicycle to record the road ahead. This unit uses a 1/2.8" Sony CMOS sensor to capture 1080p resolution video at 60 fps from 140° field of view. A Sony DSP enables the dash cam to capture video in low-light conditions. Additionally, a 100-lumen LED light provides increased visibility on the road to ensure that you're seen by other motorists. This dash cam picks up audio thanks to a built-in microphone. In the event of a collision or an accident, a built-in G-sensor will trigger emergency recording with write protection.

A built-in 2600mAh rechargeable battery ensures uninterrupted power to the camera for up to 9 hours of recording. A memory card slot supports microSD cards up to 128GB (available separately). The dash cam is housed in an IPX7-rated enclosure for protection from water."

I installed a 128GB micro SD card and am currently charging the camera up with the included (albeit short) USB A-C cable. I'm going to mount it on my friends' bike with the banded mount, go for a ride, and then check the quality of the video. Hopefully, we won't be testing any emergency recordings. Camera comes in black, yellow (the color I purchased) and pink. I'll do my best to give a review after the ride.