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Why risk a speeding ticket The Whistler Z-11R+ Laser Radar Detector features the new Advanced False Alert Detection System. This system provides the driver with FDSR field disturbance sensor rejection which reduces false alerts caused from blind spot and collision detection systems in newer vehicles TFSR Traffic Flow Sensor Rejection and multiple filter and City modes. The Whistler Z-11R+ features an icon display and 360-degree MAXX Coverage to detect from front sides and rear of the vehicle.