Feature●A SMART START! Everything you need to get started: one SpeakerHub, our unique, audio, talking (text-to-speech) hub, and two Door Sensors. Batteries are included and preinstalled, good for up to 5 years between battery changes. Supports 300+ devices from our full product line. Add more hubs for large homes, high-rise condo buildings, etc.●LETS HEAR IT for SpeakerHub! Your SpeakerHub can play from a library of sounds and tones, from a chime tone to a burglar alarm siren. It can even play your uploaded MP3 files! But never before has your hub talked to you! Now, hear your important messages in clear text-to-speech messages. Let it read out the standard alerts, or customize the message; its up to you!●WHY PAY A MONTHLY FEE, when you can secure it for free? Self-monitor and save when you take advantage of our many ways to be notified of alarms and off-normal events in and around your home or business. See "Know Now!" for more information!●THAT WAS EASY! Installs in moments: scan the sensors QR code, give it a name, peel off the pre-applied 3M brand mounting tape protective plastic, press the sensor and magnet to the door and frame, and you have added security to your home or business!●MORE THAN JUST A DOOR ALARM! Place a sensor on each exterior door and window to Protect Your Perimeter Activate and control lighting. Place a sensor on your fridge/freezer door or lid and know if it was left open, to prevent food loss. Track activity in your home or business. Keep an eye on children and elderly loved-ones. Use the sensors to protect liquor & medicine cabinets, gun safes, storage lockers & boxes.●DOOR AJAR! Our unique Door Left-Open reminder can be used to alert you to a door or window left open too long! You define the maximum time. Use our SpeakerHub, our audio hub, to play a tone or message, alerting you when a door is opened or left open too long.●NOT YOUR FATHERS DOOR SENSOR! This is a sophisticated electronic device, utilizing the latest technology. 24/7 cloud server device supervision monitors your system for online presence, signal strength and battery level, to ensure it will work when you need it! (Hub required, for full functionality)Description