Whistler XTR-440 Laser/Radar Detector Battery Operated with Built in Battery Charger with Blue Text

• Battery-powered radar/laser detector provides up to 15 hours operation on a single charge (power cord and rechargeable batteries provided)
• Provides 360-degree alerts for selectable radar and laser signals, POP mode alerts, and Safety Warning System alerts
• Blue backlit text display provides distinct visual confirmation of signals detected, signal strength, and indicates engaged modes of operation
• VG-2 cloaking technology makes you invisible to radar detector detectors; 3 City Modes and Highway Mode for reducing false alerts; dim/dark mode
• One-year warranty

I just received the Whistler XTR 440 and I am impressed at what you get for the money. The unit itself is easy to operate, and full of features found in much higher priced detectors. Visual alerts are conveyed by a blue-backlit LCD text display whose backlighting is adjustable to a variety of configurations. For example, it can be set to appear briefly during alerts and mode changes and remain off the rest of the time to save battery power. The Whistler XTR-440 runs on three AA rechargeable Ni-MH (nickel metal-hybride) batteries. The batteries (which are included) must be charged for about six hours before you use the unit the first time, and the only way to charge them is with the power cord that's included. I suggest buying an ac-dc adapter so you can charge the unit from an electrical outlet indoors instead of leaving it plugged into the car(cigarette lighter plug) any time it needs a charge. It has an auto shut-off feature which kills the power after a user-adjustable delay, so you won't come back to the car and find the detector down for the count. I'm not getting a lot of "false" alarms either, so far I'm impressed. The XTR-440 offers two filter modes to limit false alarms. These progressively increase its resistance to common sources of falses, particularly the poorly shielded local oscillators of older Cobra radar detectors, which seem to be everywhere. I run my 440 on Filter 1 default and with X band off, since New Jersey and Ohio are the only states where X-band radar continues to be found in any number and I don't live there, and it makes for a quiet ride. Finally, The only real difference between this unit (XTR-440) and the higher priced XTR-540 (about $125-$150) is the 540's built in digital compass, so if you can live without that, save the money and get the XTR-440.

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First off, I'll say this Radar Detector works admirably. However, for me it was a "must return" item.

The problem was that I could barely get to read the LCD screen on this device during daylight hours. The screen was impossible to read if the sun was high in the sky. The alerts and chirps work fine. It alerted me to the presence of a speed trap on multiple occasions. However, that only does you a little bit of good if you can't make out the words on the screen.

Another pet peeve is the "auto off" alarm. After 60-90 minutes, the unit turns itself off. However, the alert at this time is the loudest and most panicked alarm you'll hear from the device. It seriously scares you. I'd prefer a chirp every 10-15 seconds for a minute or two then an alert as it shuts off. Instead you get an ear piercing high pitched siren like alarm that seriously will startle you ever time.

So, I was not happy. Unit works well enough for a bargain unit under $100, however the poor screen quality made it a poor choice.

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Let me start out by saying that this unit has performed admirably at detecting radar, as did my prior Whistler unit.My primary reason for purchasing this unit was the battery feature. The stated 15 hour battery life was the main selling point.Unfortunately I am not getting 1/3 of this battery life despite using the recommended power saver settings.For this reason I could not recommend this detector.Save your money and go for a battery free Whistler Radar Detector

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Detection is mediocre; that's par for the course for Whistler. Don't believe reviews that say that its detection range is on par with Passport. It's not. It's adequate, but not as good as a $500 detector. You get what you pay for.

The battery life is TERRIBLE. Try 45 minutes (!) of battery life compared to 8 hours with the 540. Sad, just sad. Both detectors feature illegible displays when put against daylight. "Periscope" LEDs do nothing to alert you, although max volume is fair enough when listening to music at relatively soft level.

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I have a new BMW with only one recepticle in the center console and did not want cords all around. It seems accurate, easy to use, the cord is thin so when plugged in I can easily close the console. The battery life I don't feel is very long, easy to recharge and you don't need to keep buying batteries. I'm certainly not an expert on radar detectors but have had Whistler products before, and have been satisfied. I also felt that for the price it is a great deal.