Whistler XTR-540 Cordless Radar Detector Review

With its cordless design and incredible power saving and utilization technology, the Whistler XTR-540 Cordless Radar Detector represents a milestone in radar detector development. Whistler has been working hard over the last 2 years to boost its image, by providing a number of products to the market which have consistently performed at an exemplary level - so much so that many radar detector reviewers are now using Whistlers specifications as a benchmark for testing other models.

We decided to put this particular model to the test, to see exactly how well this cordless version could perform, given the lack of a fixed power source. Here are our findings.

Whistler XTR-540 Cordless Radar Detector Specifications & Features

Band Detection
If you thought that the cordless design of this unit would mean less bands being searched for, you might like to think again. This device equals and even beats some of the top wired radar detectors when it comes to signal detecting selection.

K, Ka, Ku, X, Instant On, and SWS are all programmed in, and this model actually takes band detection a step further than most by allowing for future bands to be manually programmed in - technically future proofing the entire device.

Display & Layout
This is probably our favorite Whistler design so far. Based on other similar models, the Whistler XTR-540 Cordless Radar Detector is slightly more compact, and features well laid out edges and curves. Everything seems to fit together nicely, and the screen is a suitable size. Notifications are clearly displayed, whilst automatically adjusting backlighting is useful when driving at night.

Unique Technology
Probably the most radical difference between this product and others in the same price range is the new specialty "POP Mode" detection. POP, or Instant On as it is sometimes called, is an extremely difficult band for radar detectors to pick up, because the omitting device only fires a beam of light at your car for a fraction of a second - unlike wide spectrum bands such as K and Ka, which require 2 to 3 seconds of data to read your speed.

Ultimately, this means that the radar detector needs to be extremely quick to report POP signals, so that you can immediately slow down. The Whistler XTR-540 Cordless Radar Detector has you covered in this respect, with the POP Mode specifically looking for POP leakage (signal bouncing off other vehicles) at a very impressive distance.

Performance & Range
With the unique POP Mode enabled, we set out for a road test with an Instant On radar installed in another vehicle. Amazingly, the results were clear from the very first test. Not only does the machine pick up POP leakage from a huge distance, it is able to provide an incredible amount of warning - even around corners - to help you avoid a speeding ticket.

Our Rating of the Whistler XTR-540 Cordless Radar Detector
Being cordless, we went in to this review thinking that we would find a number of areas which were compromised because of the reduction in power. If anything, we found the opposite. The Whistler XTR-540 Cordless Radar Detector performed incredible well, and we are proud to be able to award it 5 very large stars.