Upgraded Door Stopper Alarm Portable 120db Wedge Security Floor Door Stops Adjustable Sensitivity for Home Dormitory TravelingDescription: one hundred pc Brand New and High Quality! Women dwelling alone and traveling on my own in hotels, especially desire a door stop alarm. Once there are criminals attempting to invade the room, they will ship a high alarm sound of a hundred and twenty decibels to scare off the criminals and remind you and neighbors. Three-stage sensitivity adjustable Adjust the pressure sensitivity according to assorted conditions Stainless metal plate, durable. It is an inventive and high quality approach to deter intruders, the alarm activated when the door is driven open. It guarantees your safety and peace of intellect wherever you go. Wedge-shape design to fit any hinged door Special design for use at home, workplace and resort rooms 120dB high-pitched continual siren when activated No installation needed, easy for travelors to hold Can be used as a doorstop when energy switch is grew to become off Powered by 9V alkalin battery(PPP3 battery), 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: excessive sensitivity (vibration alarm)Package Included:1x door give up alarm (Battery is Not Included)Notes:Battery is Not Included! If the distance between the lowest of the door and the floor is less than 0.5 cm or greater than 3.5 cm, and the floor is product of marble and different very smooth materials, the product won't work properly, please watch out to buy.