The bundle includes one interior device and one exterior sensor
 
The Interior Device
Installed underneath a kitchen or secondary sink such as bathroom or mudroom
Connects to the hot and cold water lines and drain line
Automatic dripping based on exterior temperature readings
DC Power and/or battery operated
Arctic mode designed for extreme cold temperatures designed to preserve unnecessary water consumption
 
The Exterior Sensor
Installed outside within 80 feet of the interior device
Measures ambient temperatures
Communicates temperature readings every 15 minutes
Battery operated