The Samsung F-SS-PRES-001 SmartThings Arrival Sensor lets you stay connected with the people who matter most to you. By placing the sensor on your keychain, in a purse, in a glove compartment, or around a pets collar, you can receive notifications when a person, pet, or car arrives and leaves home. Put the sensor in your child's backpack, or your dog's collar and be notified when he/she arrives home, or leaves the house. Keep track of where you've placed your keys by triggering a beep based on the location of your sensor. Trigger different actions to take place when you arrive or leave home, such as automatically turn the lights on or off, or unlock or lock the door.