The Personal Reminder Sensor attaches to your door and reminds you of important tasks just as you’re about to leave home. When the beacon senses the door opening, it sends a notice to your phone, reminding you of important “must-do’s” such as taking your medicine, grabbing an umbrella, feeding your pets or turning off the air conditioner. Customize and tailor your own alerts and messages with the free easy-to-use app. Compatible with iPhone/iPad (iOS 13.4 or later) and Galaxy/Android (OS 11 or later).