It’s as easy as SET. SENSE. KNOW. SET - Hang the toddlermonitor on the inside or outside of your toddler's bedroom door and SET it from your smartphone using the toddlermonitor app. SENSE - If your toddler tries to leave their bedroom, the toddlermonitor will SENSE the motion of the door and send a Bluetooth signal to your smartphone. KNOW - You will be notified via the app if there is motion at the door and you will KNOW that your toddler has left their bedroom and is on the move.Any door. Anywhere. Bedroom door, exterior door, pantry door, basement door, sliding glass door, pool or patio door, hotel or cabin door, friend/family member’s door Cool Technology. toddlermonitor detects motion using a built-in low power, high performance accelerometer, and communicates using Bluetooth Low Energy (BLE) technology to support your child safety requirements.  BLE was designed for the low-energy power requirements demanded by the Internet of Things, optimized for use in battery powered devices, with native support on iOS and android devices. BLE avoids network reliability concerns and can be used in locations where WiFi is not available. BLE range can vary but toddlermonitor allows for good coverage of a most private homes. toddlermonitor pairs with and is fully controlled by the iOS or Android app that can be downloaded free of charge from the App Store or Google Play. Because we know you want to use toddlermonitor at night, we have also included the ability to silence your phone or put it on Do Not Disturb and still receive alerts.  App alerts include: motion, range connectivity, low battery on the toddlermonitor, and low battery on your phone. App functionality includes: ability to tailor the sensitivity and style of alert that you receive; and ability to monitor up to three toddlermonitor devices at the same time so that you can use multiple devices in your home.