Sends information to smartphone paired with SPH-10BT head unit and Pioneer(R) Smart Sync app; 4 ultrasonic parking sensors with visual and audible obstacle alerts; Provides directional proximity alerts and distance from obstruction; Only compatible with Pioneer(R) SPH-10BT; Professional installation is required; Includes rear parking sensor module, 4 parking sensors, 39 in. power/ground cable, 16.5 ft. system cable, 19 mm hole-saw bit, hook-n-loop fastener, 6 cable ties, and instruction manual;