The cable is designed for applications until tile, stone and nailed hardwood floors providing the ultimate in flexibility, making it easy to customize installation for rooms of any size and shape. It features a twin conductor with a 15 cold lead and it can be installed at 3 or 4 intervals to meet the needs of any installation. (Strips included to do an install at 3"). Due to its WiFi capabilities, this programmable thermostat, with built-in self-testing GFCI, allows you to control your floor heating system with your smartphone or on the web. If you have a busy schedule, the nSpire Touch WiFis ability to be controlled remotely can translate into huge energy savings without sacrificing comfort or convenience. The integrated Install Wizard and easy-programming options make set up a breeze. This model provides maximum control over the floor temperature with 6 programmable events for each day of the week. Also includes floor sensor.