The Bosch Smart Home Smart Door/Window Contact II Plus reliably detects open doors and windows, displaying their status in the app. It also features a vibration sensor to detect slight vibrations, making it a crucial part of the alarm system. This sensor triggers an alarm even for attempted break-ins or unauthorized window openings, acting as a deterrent before doors or windows are opened. When the alarm system is active, it alerts you to potential security risks from open doors or windows. The integrated button offers versatile functionality. Through the app, users can assign specific actions or scenarios to a brief or long button push. A double-click activates the "break function." This practical feature allows the door/window to be opened briefly (e.g., for pets) without triggering the alarm or reducing heating, thus saving energy costs. The Bosch Smart Home Smart Door/Window Contact II Plus is compatible with Apple HomeKit, Amazon Alexa, and Google Home, enabling seamless integration with numerous third-party devices. Included in the package: 1 x Sensor BSEN-CV, 1 x Magnet, 2 x Spacers, 1 x 3V CR123A Li-battery, 1 x Adhesive tape for sensor, 1 x Adhesive tape for magnetic element, warranty, and legal information. Approximate Dimensions: Sensor unit: 75mm (H) x 22mm (W) x 23mm (D) Spacer: 46mm (H) x 13mm (W) x 9mm (D) Magnet unit: 46mm (H) x 13mm (W) x 23mm (D)