Mengshen Window Door Alarms 2 Pack, Wireless Anti-theft Magnetic Sensor Alert Chime 110dB Loud for Home Apartment RV Garage Kids Elderly Safes Drawers DIY Installation

• Small Size Alarm: Compact design, smaller than most of door window alarms. DIY installation, just Peel & Stick. It is easy to mount this alarm on any kinds of doors and windows, hinged doors, roller doors, sliding doors and so on.
• Loud Burglar Alarm: Under constant alarm mode, once triggered, Continued alarm will be a great deterrence to any thieves and intruders. Under doorbell mode, loud sound will be a effective and prompt alert when your kids or pets sneak out of the house.
• 4 Working Modes: General Alarm, Constant Alarm, Closing Door Alert, Doorbell mode. Just toggle side switch up and down to set modes. Each mode corresponds to a different tone. Please refer to the product picture for details.
• Great For: Not only suitable for all kinds of doors and windows, but also for drawers, filing cabinets, safes, garage, RV, office, warehouse, store and so on.
• Low Battery Indication: Powered by 3 LR44 batteries. Low battery consumption and long standby time. It will sound "Du Du" every half hour when alarm is under low battery status.

Principle Description: This alarm is door window open alarm. Installation distance between host and magnet bar should be less than 1 cm(0.39 inch) If door/window is opened, host and magnet bar separates, alarm will be triggered once the distance is excess 1 cm(0.39 inch) Installation Instruction 1) Attach double-sided tape on back of alarm and magnetic bar, then stick them on 2 sides of seam of door or window separately. 2) Make sure the inverted-V line of 2 parts are aligned, make sure distance between them should be less than 0.39in (1cm). 4 Working Modes: 1) General Alarm: Alarm goes off if door is opened, alarm sound will stop if door is closed. How to set: Toggle switch up. Prompt sound is "Di-Di" 2) Constant Alarm: Constant alarm even door closed. How to set: Toggle switch up, down, up. Prompt sound is "Di......" 3) Closing Door Alert: Sound "Di..Di..Di.." when door is opened, it will stop when door is opened. How to set: Toggle switch up, down, up, down, up. Prompt sound is "Di-Di-Di" 4) Doorbell: Sound "DingDong" if door opens. How to set: Toggle switch up, down, up, down, up, down, up. Prompt sound is "DingDong" Product Parameters: Alarm Dimensions: 57x30x17 mm(2.2x1.2x0.7 inch) Magnetic Bar Dimensions: 35x10x10 mm(1.4x0.4x0.4 inch) Power supply for alarm: 3 x LR44 batteries(Included) What You Will Get: 2/4/10 Pack of Alarms