* Stainless Steel Cover. * High quality. * Wireless. * Adjustable High-Medium-Low sensitivity. * Vibration sensor. * No installtion required, easy for travelers to carry. * Wedge-shape design to fit any hinged door. * 120 dB high-pitched continuous siren when actiated. * 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 dedign for use at home, office, hotel rooms. * Ensures your safty and peace of mind at home or when travelling.