The Whistler XTR-140 radar detector is probably one of the cheapest radar detectors on the market. The detector is coated in black to minimize glare, and features a bright icon display.

Whistler XTR-140
I was really doubtful about the performance of a $40 detector, but after a few recent road trips, I am say that this is a well functioning product. Despite not having exceptional filtering ability for false signals, it can still give you enough X/K/Ka warning for you to slow down in time. The XTR-140 features 3 city modes, which allows you to adjust your tolerance false alerts as well.
Despite not having as many features as my ESCORT and BEL, Whistler XTR-140 comes complete with total band protection, total 360° perimeter protection, and patented VG-2 cloaking technology to prevent detection from the traffic police.
The new Dual LED Alert Periscope provides an additional attention getting visual alert. Two extra LED’s flash on and off when the unit detects a signal, which I thought was a really great innovation, because you can easily see them even when your radio drowns out the audible signals, or when the primary letter warning lights is difficult to see in bright sunlight. This alert can be programmed to flash for all alarms, remain on, or completely turned off.
I also like the ‘Quiet Mode and Auto Quiet’ feature of this detector. Quiet Mode cancels audio during an alert (which usually lasts for 20 seconds), whereas Auto Quiet reduces the selected audio level to level 1 to approximately 5 seconds after a radar or safety radar signal is detected. The greatest thing is that even in this mode, VG-2 or laser alerts are not affected.
In conclusion, the Whistler XTR-140 might not have the features of the top of the line detectors (coiled power cord, voice alert, false signals filtering, etc), it does, however, have at its core the basic detection ability a driver needs.
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