If you wish to have the portable radar detector, then a Whistler XTR-540 radar detector is the right answer. This detector is powered by using the batteries which you need to replace every three weeks. You will get the security that is supplied by the Whistler XTR-540 radar detector for your driving in the more convenience way. However, the detectors still have the weakness which is less range in detecting the POP radar signals.

Since the detectors are operated by using the batteries, the detectors will switch on and off automatically. This setting is provided by the save energy unit to save the battery power. Because of this, the detector works less effective.

Before buying any radar detector for your vehicles, it is advisable for you to look at the state rules or laws for the radar detector. The laws will also set the usage of radar detector. In many cities or states, the radar detector is allowed for the non commercial vehicles only. But in some places like the Washington, D.C. or Virginia, it is not acceptable.

Whistler Company provides you three AA Ni-MH batteries which you can charge when they are drained. You may also plug the detector to the vehicle's cigarette lighter adapter which will recharge the batteries. As you charge the batteries, they can power the detector for 15 hours. You can watch the progress of your radar detector like the signal detected, signal strength, and modes of operation indicator in the blue LCD text display.

This radar detector has the patented POP mode detection. It will send the warning if it detects any crucial condition. The warning is sent through the audio alerts. It does not only offer you the audio but also visual warning. The visual warning is provided by the low profile alert periscopes. You will be warned by two extra LED flash that will on and off. Additional features which you get from this detector are three city modes/highway modes. The highway mode will give you the full audio and the visual warning of the radar systems while keeping the full sensitivity. This setting is the default setting of the detector.

Meanwhile, the city mode will lessen the annoyance that is caused by the automatic door openers and burglar alarm alerts. It will remain quiet unless the signal strength becomes very strong. When the changing of the signal strength happens, the device gives the brief alert in order to notify you.

By using the wireless radar detector, you will have more space in your car. You do not need to face any problem with the cables. Since this device is depended to the battery, it is better for you to check the battery every three weeks to guarantee the battery is not running out of the power.