Whistler Xtr-338 Laser-radar Detector The Whistler XTR-338 Radar Detector with Real Voice Alerts Laser and radar detection, including audio warnings for bands received, a numeric icon display for easy signal confirmation of transmission and strength Alert Periscopes that flash when the unit alarms, and our patented POP Mode Detection Stay Alert: exclusive feature on this Whistler radar detector that tests your alertness on long trips The fastest radar gun technology available. - COMPLETE INFORMATION BELOW IN PRODUCT DESCRIPTION