Features: Stainless Steel Cover. High quality. Wireless. Adjustable High-Medium-Low sensitivity. Vibration sensor. No installation required, easy for travelers to carry. Wedge-shape design to fit any hinged door. 120 dB high-pitched continuous siren when activated. Can be used as a doorstop when power switch is turned off. Powered by a 9-Volt Battery (Not Included). Mini size, space-saving. No installation required. Special design for use at home, office, hotel rooms. Ensures your safety and peace of mind at home or when traveling. Specifications: Color: Black and Silver Material: PlasticandMetal Working modes: Vibration sensor Volume of the alarm: 120 dB Three sensitivity: High, Medium, Low Battery: 1x9V battery (not included) Size: 14x4.5x4cm or 5.51x1.77x1.57in Package Included: 1xDoor Stop Alarm Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.