Features: brand new and high quality Long-distance detection, accurate detection without false alarms, stable performance. Light prompt + buzzer, overcome driving difficulties and increase driving safety. When the vehicle starts, the blind spot monitoring system will automatically start, no longer worry about unexpected dangers. It monitors that the rear and adjacent lanes are approaching the target- left and right to provide early warning signals for lane change; there are for cars on both sides overtaking, and the warning lights are for always on to indicate. for Cars coming from directly behind will be warned at close range to reduce sudden braking and avoid rear-end collisions. The faster the retreating car, the farther the system monitors distance. BSD system:Detection distance: 0-5mDetection accuracy: ±3cmWorking frequency: 58KHZ+1KHZWaterproof grade IP67Controller:Working voltage: 10.6～16VWorking current: less than 200mAWorking temperature: -40℃～+85℃ Specifications: Material:ABS Size:Approx.12cm/4.72inches Color:Black/White Package Includes: 1 Set Car Blind Spot Monitoring System note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.