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Looked into the pxt ones but pricey, as you say you get what you pay for, h & f can get mountain pxt ones in, I'm in patch reception so limited where I can put my one, it works but only in certain...

Key component I have found is the delay time from detection to picture taken. If set up on the side of a track someone can walk past and you miss them. If set up in an open space not such an issue....