Batman: Thanks.
Many of them just plug into cig lighter - that means no need to get a specialist install?
Yes for our Y! Dashcam it comes with the complete mounting kit, including the required adhesive windscreen holder with VHB sticky tape, a pretty long Micro USB charger cable so you would route the cable along the top and side of windscreen, down via the door / dashboard and into your cigarette lighter and even comes with a cigarette lighter to USB charger adapter.
In the case of one of our cars, the battery / accessories remained powered on for about 10 mins after the car engine has been switched off to the dashcam will record for that duration before turning itself off upon power being cut to the accessories in the car.
Edit: Fixed typos