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Windshield Mounting

• Install the two suction cups and rubber bumper 

onto the bracket by fitting them into their holes.

• Press the suction cups onto the windshield at the 

location you have chosen.

• Slide the detector onto the bracket until it locks 

into place.

• If necessary, the unit may be leveled by bending 

the windshield bracket.

• Press the bracket release button and remove the 

detector before bending.

Power Cord Connection

• Plug the small end of the power cord into the 

unit’s power jack.

• Plug the large end into the vehicle’s cigarette 

lighter socket.

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Cord fits tightly into detector. When installing

the cord, expect some resistance. 

Fuse Replacement

The lighter socket plug is equipped with a
replaceable 2 amp, 3AG fuse located behind the
silver tip. To replace the fuse, carefully unscrew
the tip of the plug.
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Unscrew slowly. The tip contains a spring

which may fly out when disassembling. Insert the new fuse

with the spring and screw on the tip. With use, screw cap

on plug may loosen. Retighten occasionally.

Unscrew the tip of the lighter socket plug 
carefully when replacing the 2 amp fuse.

INSTALLATION

Battery Life

The unit can provide approximately 15 hours of
laser/radar detection. There are settings that can
maximize battery life.
1) Display intensity set to Dim
2) Auto Quiet engaged
3) Auto Shut Off set to 1 hour
4) Using a lower volume setting
5) Using Mute whenever possible

Important: 

The detector’s display will flash a “II”

and three fast beeps will sound when the
batteries have approximately one hour of
battery life left. This is a reminder to recharge
your batteries.

Battery Charging

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d: Plug included power cord into the

detector and into the lighter socket to slowly
charge the rechargeable batteries. This will also
provide power to the detector. The display will
dimly blink the “IIIIII” icon when the unit is
charging the batteries. When the power cable is
removed from the detector or the vehicle’s
lighter socket is switched off, the unit will alarm
and illuminate the icons in a sequencing fashion,
then turn off.

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The unit will continue to charge when powered off

until it senses a full charge.

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As with all battery operated devices, remove

the batteries when this unit will not be used for an
extended period of time. Damage caused by leaky or
improperly charged batteries are not covered under
warranty. Check with the  battery manufacturer about
their specific product warranty and disposal
recommendations.

OPERATION

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6

Rubber Bumper

Windshield
Mounting

Unit Must Be Level

Power On and Self-Test

Each time your Whistler detector is turned on,
an automatic self-test sequence confirms that
the speaker and visual display is functional.
• Press Power. Display shows in order: 

1

. X-Band   

2

. K-Band      

3.

Ka-Band 

4.

LASER

5.

SWS       

6. 

Battery Status      7

7.. Highway        

Self Test Mute

Press the Quiet button during the self-test sequence
to cancel the self-test audio.  This will not affect
radar/laser alerts.  To restore the self-test audio, press
the Quiet button during the next self-test.

Setting Saver

Setting Saver saves your personalized settings
when the detector is turned off or you lose power.

Feature Engaged Confirmation

Each time a button is pressed, one beep confirms
feature “on”, two beeps confirm feature “off”.

Audio Level Adjustment

The audio levels can be adjusted high to low or
low to high.
• Press and hold the “VOL” button and the 

volume level will increase (Level “IIIIII”) then 
proceed to lower the volume (Level 0). 
Continuing to hold this button will repeat the 
sequence. As audio level is adjusted, beeps are 
provided and the display indicates volume level.

OPERATION

7

Summary of Contents for XTR-420

Page 1: ...20 21 Other Speed Detection Systems 21 22 Warranty Information 22 25 Specifications 25 Accessories 26 Dear Whistler Detector Owner If you have questions concerning the operation of this Whistler prod...

Page 2: ...he vehicle s owner s manual supplied with your vehicle to determine if your windshield has this coating Avoid placing unit in direct contact with the windshield To reduce the possibility of theft unpl...

Page 3: ...slowly charge the rechargeable batteries This will also provide power to the detector The display will dimly blink the I II II I icon when the unit is charging the batteries When the power cable is r...

Page 4: ...nitial alarm of two beeps and then remains quiet unless the signal becomes very strong When the signal strength increases two additional beeps are provided City 1 and City 2 Modes operate the same as...

Page 5: ...in 3 5 seconds an alarm sounds and multiple scrolling icons will appear on the display Press Power to cancel Stay Alert WARNING Stay Alert is NOT intended as a substitute for adequate rest You should...

Page 6: ...lerting then suddenly a VG 2 signal is detected the VG 2 warning will override the X band alert POP MODE ALERTS POP Mode Alerts Because POP Mode radar utilizes the same K or Ka band frequencies POP Mo...

Page 7: ...E DETECTORS LEGAL In Most States YES Laser Radar detectors are legal in every state for automobiles and light trucks under 10 000 lbs except Virginia and Washington D C which have local regulations re...

Page 8: ...used by Police to detect signals radiated by the local oscillator of a radar detector Because its purpose is to identify persons driving with radar detectors these devices are known as a radar detect...

Page 9: ...n your unit as outlined in the section Service Under Warranty along with a certified check or money order for 55 00 Payment may also be made by MasterCard VISA or American Express personal checks are...

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