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Whistler's XTR-440 laser/radar detector gives you full band protection from radar signals, 360-degree laser detection, Whistler's patented VG-2 cloaking technology, and plenty more. The brilliant blue text display, along with tone alerts and Whistler's unique alert periscopes, mean you'll never miss an alert. Competitive features and competitive pricing. Never miss an alert. Click to enlarge. 4.41 x 2.84 x 1.35 inches and just 5.6 ounces. This unit features Whistler's low-profile "alert periscope" LEDs that flash when the unit alarms. Battery Powered Operation The unit can provide approximately 15 hours of laser/radar detection on three rechargeable batteries (included). It's handy for those who frequently switch cars, or use rentals, or who just don't want a power cord dangling over the dash. A power cord is included, which will both provide power to the detector and recharge the unit's batteries. Blue Backlit Text Display The XTR-440's blue backlit text display provides distinct visual confirmation of signals detected, signal strength, and indicates engaged modes of operation. Twin Alert Periscopes Whistler's Low Profile Alert Periscopes provide an added attention getting visual alert. The two