NormanW

I bought mine at Tukcom, Pattaya at a small shop that specialises in these gadgets. I don't recall the floor but they are on the stair well (east) side of the building, opposite the stairs. They have units between 2000 and 3500 baht and I asked for the 'best' and she suggested a 3000 baht device very much like a miniature-sized regular handycam with a flip-out 2.5" LCD view screen, 12 megapixels, 1080 full HD, 4 x digital zoom and a pretty bright integrated flash/flood light. It has HDMI, USB and standard 3.5mm jack a/v outlets and an SD memory slot. The lens can swivel through 180 degrees so along with the suction mounted bracket, it can go anywhere. She included a 4Gb card but I replaced that with a 32Gb one that gives loop options up to 30 minutes. It fits right up in the top-right corner of the windshield and easily detaches for parking in the sun.

I reckon for use a a 'silent witness' in accidents, having a 5 minute loop would be adequate. Why one would want to look at say a whole +2-hour drive in it's entirety beats me. The OP wants to record for a week so maybe he wants to record in a company or leased vehicle? This one turns off when you close the LCD screen since it is independent of vehicle power. As noted by Richard, this can be forgotten and so far I have left it recording endless loops of passing traffic or the gate at the house... until it automatically turns itself off! I would need a sticker on the dashboard to remind me to close the LCD screen since in the event of a prang, that may easily be forgotten in the panic.