Afraid Cermin Pecah when parking
Anyway, this is what I found out.

Go Full HD, or else cannot see number plates when moving. So no point.
Acceptable ones will cost RM200 plus
Best is to buy Capacitor type instead of battery cos heat will kill battery fast
Wiring is also important or else you can also use slim Powerbank
Take note on the Connectors, some are not standard type.
Some ppl buy Dashcam that looks like the rearview mirror to make it look stealth.
Get a higher speed card as you will be capturing FullHD videos.

And lastly...There are a lot of IMITATION models out there!! so before you buy, PM the seller to make sure its Original

all dashcam got the feature of auto startup when car start if not mistaken...

capacitor means the battery of the dashcam is a bit different...it will be more durable if your car is exposed under the sun all the time...makes it won't be spoiled that easily

not sure...bought mine from eBay (seller name: estore009 ... i think)

Some1 shared a seller up there ... maybe can check there