When a door or window is opened, a powerful 120dB alarm sounds, instantly alerting you to any unauthorized entry. It's perfect for home, apartment, and commercial security.It's ideal for protecting children from dangerous areas (such as swimming pools, basements, and cabinets containing hazardous items), and for monitoring seniors with dementia, providing added peace of mind.On/Off and Program Button: The program button easily arms and disarms the alarm, and adjusts the volume (90/120dB), while the on/off switch provides one-touch control for effortless operation.Wireless: This door alarm is powered by two AAA batteries (not included), eliminating the need for wires and providing quick and flexible installation without complicated wiring.Low Battery Alarm: When the alarm is triggered or the battery is low, a built-in LED indicator flashes red, ensuring an immediate visual alert so you can take swift action.Note: This door alarm (model: D130) does not support remote control (RC5311), but various settings can be accessed via the program button on the main unit.