Features:Great safety and security device at a very reasonable price! Extra Loud Alarm - Sounds a loud 120 dB siren when protected door is opened. Acts as a door wedge to stop an intruder from entering. Wedge shaped door stop design prevents further entry the harder they push. Inexpensive and portable solution for hotel doors, offices, dormitory room entrances or your home. Bottom of door alarm has anti-slide pads to hold it secure. Three position motion sensitivity control activates the alarm if the unit is moved. Stainless Steel Cover. 3 Sensitivity Levels - Low - Medium - High. Easily portable small size of 6" x 2" x 2-1/4". Runs on one standard 9 volt battery (not included). Instructions and product info included.