upgraded portable door ser security alarm 120db loud entance device for travel home apartment house doorssafety tools

the door ser alarm in "on" status,when door pressure is applied,the door alarm will be triggered while make extremely loud 120db alarm, helps wake/alert homeowner or renter security protection. tthe door ser alarm in "off" status,it can be used as common damping rubber base door wedge,hold door in open position,no any loud alarm sound. no wiring needed; battery-operated (requires 1x9v battery,not included);place it under the door,the gap bewteen the bottom of the door and the floor should be 5mm(0.2 in) to 35mm(1.35 in) low - medium - high,with an adjustable sensitivity switch on the side;h level is the most sensitive level that vibration will trigger an alarm. supply good customer service. if you have any question about our product, please do not hesitate to contact us, we are always ready for you..syi