Excelvan 360 Degree Car Full 16 Band E8 Speed Safety Radar Detector Scanning Advanced Voice Alert Laser LED This Radar detector features a laser eye detector for a 360 degree laser detection, no special installation and easy control. It can detect any mobile radar Speed Monitor 250-2500m ahead.not including stable radar speed monitor When you detect a position, the detector will tell you by make a sound to show you are approaching speed detection device, so you can confirms your speed on the stretch of road. Extreme Range Super technology, with super-fast sweep circuitry, provides extra detection range and the best possible advance warning to even the fastest radar guns. Help you driving safely and avoiding some traffic fines. Relative speed sensing auto shutdown feature will render your detector undetectable by currently available radar detector.