OttoNavi Car Automotive Rear Blind Spot Senor Detection Monitor System Detects objects in your blind spot up to 6 feet away Optional sound alarm and warning light Turn signal activates the alarm system and individual LEDs will indicate if an object is in your blind spot Come with everything you need for easy installation 2 x Sensor, 2 x Indicators, 1 x Sensor Harness, 1 x Indicator Harness, 1 x Speaker, 1 x Hole Saw