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The P.I.R. sensor can be mounted anywhere indoors. It will pick up the heat movement of a person in a room and activate the door chime.
This product will only work with Byron SX products (except SX4 and Sx41). They can be used with wirefree magnetic door/window sensors(model 802) and be combined with further additional sensors.
Each sensor can trigger a doorchime to play the same, or a different sound.