Compact magnetic door and window alarm that alerts you when openings are detected and helps prevent unauthorized entry or accidental leaving open. Choose from four easy modes to match how you want the device to respond. Key features and benefits Four operating modes: General Magnetic Alarm: sounds when a door or window is opened. Constant Alarm: continues sounding for at least ten seconds even if the opening is closed, until manually turned off. Closing Reminder Alarm: alerts you if a door or window has been opened but not closed. Doorbell Mode: emits a dingdong tone when a door is opened to announce visitors. volume deterrent: builtin 110 dB alarm provides an immediate, loud warning to deter intruders and draw attention to unintended openings. Simple operation: use the on/off button to power the unit and press it 1, 2, 3, or 4 times to select the desired mode. Low power consumption helps extend battery life. Low battery alert: when battery power is low the unit emits a DuDuDuDu tone to indicate replacement is needed. Versatile placement: fits doors, windows, cabinets, mailboxes, and other openings where unauthorized access or unintended opening is a concern. Performance and compatibility Loudness: 110 dB provides clear audible notification over ambient noise. Power: designed for low consumption to maximize battery runtime. Battery type and replacement procedure are user managed. Size and mounting: compact form factor suitable for discreet installation on a wide range of door and window frames. Magnetic sensor pairing enables reliable detection of open and closed status. Materials: durable housing for everyday indoor use. How it solves common problems Prevents unnoticed openings that can let children or pets out, or allow cold air or pests in. Acts as a visible and audible deterrent to opportunistic intrusion. Reminds household members to close doors and windows, reducing energy waste and security risks. Provides a door announcement option when a silent or low profile entry alert is preferred. Typical use scenarios Home safety: install on a child bedroom door or ground floor window to alert parents to unexpected openings. Office and business: place on supply room doors, cabinets, or back entrances to detect unauthorized access. Apartments and rentals: mount on mailboxes, patio doors, or storage closets to provide a simple, battery powered alert without wiring. Operation tips Press the on/off button once to turn on. Press again 1, 2, 3, or 4 times to cycle to the desired mode. Press and hold or press once as needed to power off. batteries promptly when the low battery tone DuDuDuDu sounds to maintain reliable performance. Position the magnet and sensor within the recommended gap for consistent activation. This compact magnetic alarm offers flexible modes, a volume alert, and easy setup to improve security and reduce accidental openings in homes, offices, and other everyday spaces.