A dash cam is necessary when you are driving because the primary job of dash cams is to protect their owners' interest by documenting what happens in front of them in a wide-angle view, when they offer other features—everything from lane-departure warning to collision alerts to red-light camera warnings—they're usually not that good at them. Dash cams are simply meant to mount on your windshield, power up every time you start the car, and capture video endlessly while driving.

The Aoni 237 HD car DVR comes out solidly on top with ultimate features. It hits the mark in terms of image quality, usability, and value, and it avoids unnecessary features that are found in many pricier cameras. Instead, it focuses on great image quality and reliable, automatic operation each time you get in your car. Other cameras tick these boxes as well, but none hit them all quite as perfectly as the Aoni 237 while also selling at a great price. In short, it's the best car DVR for most people.

The G-Sensor senses sudden acceleration, braking and collisions in order to automatically capture and protect the current videos surrounding an accident. Then the critical files won't be deleted by loop recording. Seamless loop recording does not allow one second leaking, on the contrary, more reliable and secure when the memory card is full, under this circumstance the car DVR camera will cover the earlier videos and continue recording new ones, while the protected files stay stored.

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