Mini Size Alarm: Compact design, smaller than most door alarms. DIY installation, peel and stick. The alarm can be easily installed on any type of door or window. 110 dB loud alarm: In continuous alarm mode, once triggered, the continuous alarm will be a great deterrent for thieves and intruders. In doorbell mode, the loud sound will be an effective and quick reminder when your child or pet sneaks out of the house. 4 operating modes: general alarm, continuous alarm, door closing alarm door and doorbell mode. Simply toggle the switch up or down to set the mode. Each mode corresponds to a different tone. Please see product images for details. Wide range of applications: not only suitable for different types of doors and windows, such as swing doors, rolling doors and sliding doors, but also to refrigerators, drawers, filing cabinets, safes, garages, RVs, offices, warehouses, stores, etc. Low battery indicator: Comes with 3 LR44 batteries (batteries not included with the product ). Low battery consumption and long standby time. When the alarm clock battery is low, it will beep every half hour. Single product weight: 36.5g Product size: 33*56*17 mm (host) 11*35*10 mm (magnetic strip) Note: The data are all manually measured, please allow 1-3cm error due to differences in light and display, There may be color differences, please refer to the actual item received.