Adding additional CURT Tire Linc TPMS Sensors into your Tire Linc system enables you to keep an eye on as many as 20 tires simultaneously, making it an excellent option for towing 5th wheel trailers, utility trailers, or even boats and agricultural trailers. It's easy; all that's required is the replacement of your tire's existing valve stem cover with the Tire Linc tire sensor, which can be screwed on easily by hand. The sensor reads tire pressure and connects to your Tire Linc system, so that you can monitor the pressure from your smartphone while towing in real-time.• Additional sensors to allow you to monitor up to 20 tires simultaneously• Great solution for larger motorhomes and tow vehicles• Easy, DIY, screw-on installation• Two sensors per pack• Sensors come with CR1632 batteries (replaceable)• Requires CURT Tire Linc Auto Repeater (item 150063 sold separately) to connect to sensors Easily installed by replacing your tire's existing valve stem cover Sensor reads tire pressure & connects to your Tire Linc System Two sensors per pack | Curt Tire Linc Auto TPMS Add-On Sensors, 2-Pack