When comparing G1W vs Black Box B40 / A118 , the Slant community recommends G1W for most people. In the question“What are the best dash cams around $100?” G1W is ranked 2nd while Black Box B40 / A118 is ranked 3rd. The most important reason people chose G1W is:
the G1W can be configured to start recording when motion is detected.
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Pros
Pro Includes motion sensor
the G1W can be configured to start recording when motion is detected.
Pro Easy to use, lean interface
G1W cuts out unnecessary features, so the interface is easily operable with minimum clutter.
Pro High definition camera with crisp picture
The G1W shoots 1080p at 30 frames per second.
Pro Fits behind the rear view mirror
The G1W isn't the smallest, but it is still very discreet and out of the way because it sits behind the rear view mirror.
Pro Records in 1, 3, or 5 minute loops
Pro Heat resistant
The B40 is heat resistant up to 140°F.
Pro 170° Super Wide Angle 6G Lens
Pro Discreet
The B40 is one of the smallest and least noticeable dash cams out there. Additionally, this dash cam is completely black and fits right behind the mirror. This camera looks like part of the car, not an addition.
Cons
Con Vibrations muddle the sound quality
Due to the G1W's cheap build, the parts rattle. This causes some interference with audio quality but shouldn't be a deal breaker.
Con It is common for the mini-USB plug comes loose
Con Turns off as soon as the car turns off
If the car is off, there is no way that the camera can be recording.
Con Occasionally has problems focusing
When this cam is rapidly heated, some users have reported the video to be blurry or out of focus. Although this is an inconvenience, the cam is still able to do its job.