The nVision„¢ TPMS is the only tire pressure monitoring system made specifically for RVers and Tow'ers. Easiest to install and use, there's no professional installation required for this monitoring system. The included Quick-Set Installation Cord„¢ makes the monitor portable so you can take with you to each tire. Monitors proper tire inflation and temperature with several alerts: 2 Stage Low Pressure, High Pressure and High Temperature. The nVision„¢ TPMS monitor inlcudes four programmable memory settings for different vehicles and trailers so the monitor is easily transferable between vehicles. Monitors up to 24 tires simutaneously in each memory position and works on all sizes of tires up to 200 PSI. Additional wireless tire pressure sensors (two per pack) are availableand compatible with the 30100a nVision„¢ Tire Pressure Monitoring System. These sensors come 2 per box.