Add Tire Linc Tire Sensors to your Tire Linc System to monitor up to 20 tires at a time. This is a great solution for larger RVs and coaches or tow vehicles. Installation is simple. Just remove your tire's existing valve stem and screw on the Tire Linc Tire Sensor. The sensor will connect with your Tire Linc System, and then you can set the designated pressure and temperature ranges accordingly.• Two sensors per pack• Monitor up to 20 tires simultaneously• Great solution for larger motorhomes and tow vehicles• Easy do-it-yourself installation Monitor up to 20 tires simultaneously Easy do-it-yourself installation Two sensors per pack | Lippert Tire Linc Tire Sensors, 2-Pack