The UltraPro Audible Window and Door Alarms provide a simple-to-use, cost-effective security solution to protect against home invasions. The 120-decibel alarms are loud enough to make a would-be intruder think twice about entering through your doors or windows. Each alarm features an easy-access chime/OFF/alarm switch. The straightforward design makes your security setup intuitive and streamlined. With no wires required for installation, protecting an entry point is as easy as mounting the alarm using the included double-sided tape. When a door or window is opened the alarm's base becomes separated from its magnet, triggering a gentle chime or ringing alarm. It's even great for alerting you when other indoor areas, like cabinets and drawers, are accessed. Powered by four included LR44 batteries, the LED indicator on the front will notify you when power is low. This set of UltraPro Audible Window and Door Alarms are perfect for homes, apartments, dorm rooms, offices, RVs, campers and much more.