Portable Motion Alarm System With 90dB Siren Featured with ear piercing 90dB alarm siren sound when motion is detected within the covered area. Swivel cabinet for adjustable detection angle. Pocket-sized alarm with motion detector and easy for indoor installation. Portable protection for personal and home use. Can be fixated on the wall horizontally or vertically or simply put on the desk or hand carry. Operated by DC9V alkaline battery (not supplied). Featured with external terminal block inside the battery compartment for optional hookup with external contact sensors or magnetic detectors. Cost-efficient motion alarm with expandable option and further integration with existing or new home automation system. Slide switch for Alarm/Chime/Off setting. Low power consumption design for long lasting operation.