Security bar for sliding door, or door knob. Stops it from being opened and alarm when attempted. EXTREMELY LOUD SIREN: Due to the sensitive vibration sensor and 120db alarm attachment, you and your loved ones will be kept safe and alerted (up to 1000ft away) if any intruders attempt to tamper with a door or window etc. 2-IN-1 DOOR SECURITY STOPPER & SLIDING DOOR JAMMER: Use this device for two different purposes with easy interchangeable caps for hinged doors and sliding door/window DOOR STOP SECURITY BAR: Angled rubber bottom that assures full contact and strong grip on all types of floors without scratching them ADJUSTABLE AND DURABLE: The door safety bar can be adjusted between 22.25"-43. 7" and constructed of high grade iron to withstand 350 pounds of pressure *please note: the sliding door caps decrease the maximum length to 39. 25" EASY TO USE: The door stopper alarm easily props under door knob and easy to remove. Security bar can also be easily adjusted.