Burglar Alarm, Burglar Alarm, Audible Alarms, Home Alarm System, 120db, Wedge-shapeOOTDTY Features: 100% Brand New and High QualityAdjustable High-Medium-Low Sensitivity. Vibration sensor, professional and durable. No installation required, simple for travelers to carry. Wedge shape fits any swing door.120 db continuous high intensity siren when activated. Specification: Material: Metal + Plastic Size: As the picture showsPackage Included: 1 x Home Security Alarm. Note: If the gap between the door bottom and the ground is less than 0.5cm/0.19in or greater than 3.5cm/1.38in when the door is opened, and the floor is made of very smooth material such as marble, it may cause the product not to work normally. Buy carefully. Please allow 0-1cm error due to manual measurement. Make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!