The product is a set of four Rostra 250-1922 BackZone Ultrasonic Parking Assist Sensors in white. These parking sensors are designed to assist in detecting objects or vehicles behind the vehicle to help with parking in tight spaces. With the Rostra brand known for their quality products, these sensors are likely reliable and efficient in providing accurate parking assistance. Perfect for vehicles equipped with parking sensor systems, this set of sensors offers a convenient and practical solution for parking difficulties.