If you want the peace of mind of a home protected by motion sensors, but hate the idea of cluttering your home dcor with unattractive modules, this Curtain Micro Passive InfrarRed (PIR) Motion Detector is for you. Measuring only 2 3/4" x 1 1/4" x 1", these units can fit almost anywhere. Requires 10-16V DC power supply (sold separately). A Standard Micro PIR Motion Detector is also available.