[Security and Privacy]This door stoppers security provides you with extra security and privacy, which greatly increases your security and prevents unauthorized entry, so the door cannot be opened from the outside even without a key. Suitable for hotels, dorms, apartments, short-term rentals, airbnbs, bathrooms, bedrooms or private rooms. This is your good helper when you are on a business trip, traveling or living alone. [Door Stop Alarm]Door stop alarm has stainless steel pressure plate inside, non- bottom, and 3 sensitivity levels - low-medium-high, with 120DB siren, once someone opens the door, the door stop alarm will sound off first, they will scare guy and help wake you up and give you time to help. Requires a 9v battery (not included) [Easy to Install and Carry]Easy to install or remove, you can install this door lock in seconds without any tools. Small enough to fit in your pocket or handbag. Easy to install or remove, our door alarms for home security installs in seconds without any tools. [Sturdy and Durable]Security door stopper is made of sturdy stainless steel. Sturdy plastic cover prevents door damage under pressure. The steel surface with electroplating and polishing technology ensures a smooth touch and minimizes damage to the skin. Strong high-quality door locks can a longer service life. [Easy to Install]-door stop alarm is powered by a 9V battery (not included).just simply place the stopper under door (For inward-opening doors only). The space between the door and the floor should be 10mm (0.39 inch) to 35mm (1.38 inch). About the door lock, just need to insert it into the door hole on the side. Colour:black Material:ABS+stainless steel Package Contents: 1 x Door Stop 1 x Alarm Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.