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. 110dB Loud Alarm: In continuous alarm mode, once triggered, the continuous alarm will be a great deterrent to thieves and intruders. In doorbell mode, the loud sound will be an effective and timely reminder when your child or pet sneaks out of the house. 4 Working Modes: General alarm, continuous alarm, door closing alarm and doorbell mode. Simply toggle the switch up or down to set the mode. Each mode corresponds to a different tone. Please see the product images for more details. Wide range of applications: Not only suitable for various types of doors and windows, such as swing doors, rolling doors and sliding doors, but also suitable for refrigerators, drawers, filing cabinets, safes, garages, RVs, offices, warehouses, shops, etc. Low battery indicator: Comes with 3 LR44 batteries (batteries not included with the