Features: The radar transmits signals to the lights, with two states: 1) always on, and 2) flashing. Level 1 alarm: the reminder light remains on. Level 2 alarm: the warning light flashes and the buzzer sounds. Normal equipment state: 1) After the equipment is powered on, the left and right indicator lights flash three times respectively. 2) When the vehicle speed exceeds 15 km/h and a target vehicle is detected in the blind spot, the indicator light turns on, the steering buzzer sounds, and the indicator light flashes. There is a blind zone at the rear of the vehicle that may affect driving safety. This system is a vehicle assistance device designed to help drivers change lanes safely while driving. Easy to install. Package Includes: 2 x Car Blind Spot Detection Sensors Specifications: Material: Plastic Type: 5V, 12V Note: This product requires a compatible radar warning system to function and cannot be used alone. Please allow 1 mm error due to manual measurement. Due to differences in monitors, the picture may not reflect the actual color of the item.