Not only that, the competing products come with a display. Pearl's product assumes you have a phone on your dashboard, running their app. User comment: "any time you backup, you need to manually launch the app and wait through a 3-5 second lag as the video feed loads."
Those guys are automotive noobs. Their recommended temperature range is -4°F (-20°C) to 113°F (45°C). You can easily exceed those on a car body. Automotive temperature range for components is usually considered to be -40°C to 125°C. Their device is also battery powered, so it will need a recharge or a new battery regularly. Everybody else wires into vehicle power, so it's install and forget.
They say they're going to do self-parking next. As a retrofit. Right. Those guys need to get out of Scotts Valley, move to Detroit or some place with auto parts plants, and get their hands dirty.
[1] https://www.amazon.com/Vehicle-Backup-Cameras/b?ie=UTF8&node...