ATTENTION SENSOR INCLUDES: 1 ATTENTION SENSOR The touch-activated Attention Sensor helps you and those at at home reach each other when immediate contact is important. This sensor acts as an instant messenger for family and friends that can alert the Home Key device about a change in status or a task that needs doing. For peace of mind mount it beside an elderly parent's bedside or next to the front door so the kids can alert you the moment they come home - it's a great way to stay in touch, and on top of life. (Requires the Home Heartbeat Starter Pack)