Dash Cam for your Car.

Good dash must be at least 3″ size cross legnth.
1080P HD Video Quality.
Wide angle at least 140 degrees.
Support a large TF card (32 GB is OK)
Sound through speaker.
Shell should be made of metal.
Option for night vision.
24 hours loop recording to protect the memory card space automatic over writing of older videos.
G-Sensor to automatically lock files in case of accident.
Must operate when parked. Must start recording automatically when detects any impact or collision.
Motion detection. Automatically start recording when detects any moving objects near to the vehicle.
Should allow power through dash board charger connection.