Whistler Xtr-420 Battery Operated Radar Detector

• Battery-powered radar/laser detector provides up to 15 hours operation on a single charge (power cord and rechargeable batteries provided)
• Provides alerts for all radar and laser signals, and Safety Warning System alerts; 3 City Modes and Highway Mode for reducing false alerts
• Bright icon display offers easy-to-read display to indicate power, city mode, radar band identification, and signal strength
• VG-2 cloaking technology makes you invisible to radar detector detectors
• One-year warranty
• Battery Operated
• Icon Display
• Internal Battery Charger
• High Gain Lens
• Total Band Protection

Actually bought two, my son and myself...easy to use, not to many false alarms. The battery doesn't last as long as advertise but definitely last several hours.

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I'm somewhat confused by all of the sounds. I don't find the instructions very clear. I like having a city option.

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Works just fine as far as its advertised purpose -definitely does an admirable job of detecting police radar/laser transmissions. Often, I feel as though perhaps it works too well. That is, we'll be driving by airports (or other radar-intensive places) and this unit will pick up the transmissions.

A couple of issues: for whatever reason, the unit will unexpectedly sound all its alerts, and then shut itself off. No idea why. The unit will power back up without any issue, but obviously weird that it'll just turn off for no reason. Sent it into Whistler for service. They replaced the batteries and sent me instructions on how to reset the unit. Okay ... well, I guess if it still works ... But yeah, other than being slightly annoying, while it shuts itself off on occasion, it works as advertised.

Battery life isn't nearly close to being as billed. Realistically, it goes for about four-to-six hours or so before needing a charge. I find that operation (and recharging) seems to be a little smoother if you plug it into an AC source as opposed to running off your car's power. That, and it's one less cable to have to maneuver around in the car.

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I checked this device all possible ways, and the conclusion is only one: it is not working properly. It simply cannot detect any radar or laser beam. No reaction while passing speed cameras, automatic doors, when police is pointing radar at you, just nothing.

I'm really disappointed, as I also possess old Cobra device which is even too sensitive, giving me also some false alarms, but always detects all speed cameras and other road traps.

I don't know if my device is just broken (but all initials tests and settings tells it's OK) or it is just designed wrongly and it is just weak product,

Wasted money. That's all

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I have used the Xtr-420 back and forth to work since I received it and the unit turns itself off during each trip. Batteries only last about 4/5 hours. Yesterday I drove from Atlanta, Ga to Jacksonville, Fl and it arbitrarily turned itself off three times. Sending it back. for a replacement. When it is on it appears to work fine.