... , 4~6 external sensors 2. This TPMS is suitable for car, truck , and coachTechnology date :1. internal horn volume: 65~80 ... : LCD display ,4 external sensors , color box ,wrench ,free cradle , wires FREE CRADLE COLOR BOX DISPLAY BUTTON AND ICON DESCRIPTION : SENSOR ... your business booming ! stand alone Wireless TPMSwith external sensor for car and truck