Fangrui Product Details Enhanced Security: Equip Your Home Or Hotel With Our Advanced Vibration Detector Alarm Sensors. These Devices Are Designed To Detect Any Unusual Vibration, Providing A High Decibel Alert To Prevent Theft And Unauthorized Entry. Versatile Installation: Easily Installable On Any Door Or Window, The Sensors Are For Enhancing Security In Any Residential Or Commercial Space. Adjustable Sensitivity: Customize The Sensitivity Settings To Match Your Security Needs, Ensuring That You Receive Alerts For Significant Disturbances Without False Alarms. And Reliable: Built To Last, These Sensors Are Made From High-quality Materials That Withstand Everyday Use And Provide Consistent Performance. Color: Silver Material: Plastic Package Contents: 1 X Induction Alarm Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.