Smart Things Presence Sensor Samsung Smart Things Presence Sensor The Smart Things Presence Sensor can be used in a child’s bag, a car or around a pet’s collar & will send you a notification when they arrive or leave home. It can also emit a beeping noise to help you find your keys at home. Know when loved ones come & go By placing a Presence Sensor in a purse, on a keychain, around a pet’s collar, or in a child’s backpack, you can get notifications when loved ones come & go. Smart Home. Intelligent Living. Smart Things lets you easily monitor, control & secure your home from anywhere.