Emits a powerful 120dB alarm when a door/window is opened, instantly alerting you to any unauthorized entry, perfect for home, apartment, and business security. Ideal for keeping kids safe from dangerous areas (Such as pools, basements, cabinets containing dangerous goods, etc.) and monitoring elderly individuals with dementia, providing extra peace of mind. On/Off & Set Button: The Set button allows for easy arming, disarming, and volume adjustment (90/120dB), while the On/Off switch provides one-click control for effortless operation. Wire-Free: Powered by 2 AAA batteries (not included), this door open alarm is wire-free, offering quick installation and flexibility without the need for complicated wiring. Low Battery Alert: The built-in LED indicator flashes red when the alarm is triggered or when the battery is low, ensuring immediate visual alerts for prompt action. Note: This Door Alarm (Model: D130) does not support remote control (RC5311), but various settings can be completed through the Set Button on the host. This battery-powered door/window alarm features an ON/OFF switch and Set button for easy use. It emits a 120dB alarm when a door/window is opened, perfect for home, apartment, and business security. Also great for monitoring kids, elderly, and dementia, providing extra safety and peace of mind.