Compact magnetic door and window alarm with four selectable modes and a 110 dB siren. Designed to alert you to unauthorized openings, remind you to close doors and windows, or act as a doorbell sound when needed. Key benefits Simple protection for home and small spaces: quickly detects an open door or window and emits a loud alarm to deter intruders and draw immediate attention. Flexible alert options: choose the alert behavior that fits each situation, from a brief chime to a continuous alarm. Low power design with battery warning: energyefficient operation extends battery life and provides an audible low battery warning (DuDuDuDu) so you know when to the battery. Easy to install and operate: one switch controls power and mode selection with no complex setup. Features Four operating modes: 1. General Magnetic Alarm: alarm triggers when the door or window opens. 2. Constant Alarm: once triggered, the alarm continues for at least ten seconds even if the door or window is closed, until turned off. 3. Closing Reminder Alarm: alerts when a door or window is opened and remains open, reminding you to close it. 4. Doorbell Mode: emits a dingdong sound when the door opens to announce arrivals. Super loud 110 dB alarm: immediate, volume sound to attract attention and discourage unauthorized entry. Low consumption design: conserves battery life for longer use. Low battery audible warning: emits DuDuDuDu when battery is low. Easy mode switching: press the on/off switch 1, 2, 3, or 4 times to select modes; press once to power on or off. Suitable applications Home entry and windows: use on front doors, back doors, sliding doors, or windows to detect unwanted openings and protect property. Child safety and cabinets: place on cabinets, closets, or playroom doors to prevent children from accessing restricted areas or leaving unsupervised. Mailboxes and garages: mount on mailboxes, storage units, or garage doors to receive an audible alert when opened. Offices and hotels: monitor office doors, supply rooms, or guest room access and use doorbell mode for visitor notification. Performance and compatibility Works with standard magnetic door and window setups where a sensor and magnet can be aligned across the opening. Designed for everyday indoor use in apartments, houses, offices, hotels, garages, and mailboxes. Audible output and mode behavior match descriptions above for reliable, predictable operation. Operation notes Align the magnetic sensor and alarm unit across the door or window frame so the alarm detects opening. Use the single switch to power the unit and cycle through modes by pressing 1 to 4 times. batteries when the low battery audible warning sounds to maintain reliable performance. This alarm provides a straightforward, adjustable alert system to increase security and awareness without complicated installation or setup.