1Function: The car radar detection device is a laser eye detector for a 360 degree laser detection, can detect any stable or mobile radar speed monitor 200?800m/219?875yd ahead. 2Voice Prompt: When you detect a position, the Gps will tell you by make a sound to show you are approaching speed detection device, so you can confirms the your speed on the stretch of road. 3Professional Manufacturing: Extreme range super heterodyne technology, with super fast sweep circuitry, provides extra detection range and the best possible advance warning. 4Mute Design: Uses a speed sensing auto mute system that virtually eliminates false alarms and will keep your detector from being detected by currently available radar detector. 5Remember Detector Settings: Provides complete immunity to Vg?2 radar detectors and can electronically remember radar detector settings for an indefinite period of time even with the power removed.