More Convenience and SecurityWhen the door is opened, it will be triggered and emit a 120dB alarm to warn you and deter intruders to protect yourself and your privacy. Convenient and portable for on the go, easily positioned at entry points no matter where Excellent DesignFeatures an adjustable sensitivity switch on the side with 3 levels of sensitivity - Low / Medium / High. You can adjust the sensitivity as you need Widely usedUsed in homes, offices, hotels, retail stores, apartments and workshops. When the switch is off, it can also be used as a regular doorstop to keep doors in the correct position. (A NOTICE: Works ONLY with inward opening doors) Built to lastMade of ABS plastic and stainless steel plate for durability, rust resistance and high strength. There is buffer rubber on the bottom, but it is not recommended for use on floors that are too smooth Note: The data are all measured manually. Please allow an error of 1-3cm. Due to the difference between light and display, there is a certain color difference, which depends on the actual object received