Description: Double Suction Cup Door Blocker: It can be used for both inside and outside doors, without limiting the door interspace, and can be applied to all kinds of doors. Suitable for anyone who needs privacy and security.Door Stoppers Security: Physical mechanical structure, aluminum alloy material, sturdy; 120mm disc diameter design, increase the support surface, the larger the disc diameter, the larger the support surface, the stronger the blocking force.Door Blocker Alarm: intelligent sensor chip, alarm immediately when there is movement, highly sensitive, vibration will alarm and sound. Lasts for 6 seconds, 80 decibels, high pitched alarm.Easy To Install: Portable door lock, no need to punch holes, just press the buckle hard in front of the door, and it can be installed and removed in seconds without any tools.Wide Application: Door can install the lock on any type of floor, flat or tilted. Very suitable for use at home, office and hotel rooms when going out (can pass high speed rail, , and airplane security). Specification: Material: Aluminum AlloyProduct Size: Height About 21.5cm/8.46inch Package Includes: 1 Door Stopper Note: Please allow slightly errors 1-2cm differences due to manual measurement.