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identifying what variables are more important than others.

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and up to 48 hours of battery life.

and a sync module to get started.the most interesting identification was one I almost ignored as a false positive.

Image: Simon BissonDont worry about the microphone hanging out the window.as the Pis audio port doesnt support a microphone.

I put it down to the siren of a passing police car or ambulance.which was surprising given I live in an inner suburb of London.