I have the front and rear Thinkware U1000 for many years with no issues. With our cars, power completely shuts down after 5 minutes of turning the car off so battery drain is not an issue. If you do however want to use the full capability of parking mode, you will have to install a backup battery.
Haven’t looked at the U3000 specs but I’m sure they’ve made some good enhancements. The recording and playback quality excellent and 2nd to none in my opinion.
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