Q. does this come with a circuit diagram, and can it be used as an alarm to dectect movement, thanks
A. Hi Paul. Thank you for your question. A data sheet has been added to this product and will be available to view from tomorrow: the data sheet has the circuit diagram. As far as it being used for an alarm system, it could be used but would need the correct components to be used to make it work. So may be using the LED output or the stereo jack output can be used as n out for detection/alarm.