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For RVs, MotorHomes, 5th Wheels, Coaches and Trailers. The TireMinder A1AS is the world's first unified monitor and smartphone based RV tire monitoring system (TPMS). This new model includes the ability to simultaneously display up to 22 tires on the included 5.5" display or using the smartphone app. Large 5.5" Color LCDIncludes Transmitters, Tireminder® A1AS and rhino signal booster for superior signal strength Smartphone Not Included.