Door Lock Portable Alarm Locks Self-Protection Door Stop Travel Accommodation Door Stopper Door Lock Security Device. Features: 1.The lock is a portable door lock that installs and remove in seconds without any tools required. 2.The innovative system of hinges and angles anchor the firmly to floors when outside pressure is exerted on the door. 3.The lock is a unique, new and innovative portable door security device for anyone needing privacy and security. 4.Give you additional safety, security, and privacy. 5.The adjustable foot, situated at the end of the hinged leg, allows the lock to be installed on any type of floor: flat or inclined. 6.This revolutionary security device installs in seconds, creating a vertical force against outside pressure Size: 88mm*120mm; Surface Finishing Lacquered; Features Durable, portable, easy to use. Two CR2032 batteries. The indicator light flashes every 6 seconds.Start working after flashing. Ring for 5 seconds each time.80 decibels.Battery standby for 3 months. Normally can be used 60 times. Installation requirements: 1. Ceramic tiles, wood floors, marble and cement floors can all be used. 2. Most hotel doors and household doors can be used. (The door opens inward). Unusable doors: 1. The bottom of the door is hollow (recessed). 2. The bottom of the door is raised. 3. Anti-theft door/iron door/aluminum door/glass door, no seam, uneven facade and floor. Package Included:1 x Portable Lock.