Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.
Projector for sale. Can be used as an Android media player without additional devices. Watch movies, series, streams (YouTube, Netflix). Play games via HDMI. I watched movies a few times via hdmi from a laptop. Mostly lying around.
