Our top pick comes from Crimestopper, a company with more than 30 years of experience in the field of vehicle security. Their expertise is evident in their blind spot detection system and its durable components. The system has four sensors in total: two in the front and two in the back. These sensors ensure that all vehicle corners are covered at all times and provide assistance when changing lanes. The Crimestopper system is linked to the turn signal and will be automatically triggered when the driver uses the lever before switching lanes. Once a car enters the blind spot area from any corner, the system will instantly notify the driver via an audible buzzer and LED indicator. Car owners can install the buzzer anywhere and still be able to hear it thanks to the adjustable volume feature. Each blind spot sensor kit comes with waterproof sensors and has a detection range of 3 to 10 feet.