Description: 100% Brand New and High Quality Women living alone and traveling alone in hotels, especially need a door stop alarm. Once there are criminals trying to invade the room, they will send a high alarm sound of 120 decibels to scare off the criminals and remind you and neighbors. Threestage sensitivity adjustable Adjust the pressure sensitivity according to different situations Stainless steel plate, durable. It is an ingenious and effective way to deter intruders, the alarm activated when the door is pushed open. It ensures your safety and peace of mind wherever you go. Wedgeshape design to fit any hinged door Special design for use at home, office and hotel rooms 120dB highpitched continuous siren when activated No installation needed, easy for travelors to carry Can be used as a doorstop when power switch is turned off Powered by 9V alkalin battery(PPP3battery), no wiring (Battery is Not Included) Specification: Working Voltage:9V Size:14*4.5*3.8cm Weight:90g Main Color:Black Specifications: Working Voltage:9V Size:14*4.5*3.8cm Weight:90g Main Color:Black Sensitivity L file: low sensitivity Sensitivity M file: sensitivity Sensitivity H file: high sensitivity (vibration alarm)