Whistler GT-438XI

• FDSR (Field Disturbance Sensor Rejection) – Minimizes false alerts caused by blind spot monitoring and collision avoidance systems.
• TFSR (Traffic Flow Sensor Rejection) – Filters out false signals from radar-based traffic sensors, improving urban accuracy.
• Detects European Laser Guns – Compatible with Trafficpatrol XR, Reigl, Jenoptik, Laveg, Truspeed, and more for international protection.
• Ka Narrow Mode – Focuses detection on 34.0 GHz and 34.3 GHz frequencies to reduce false Ka-band alerts and improve target detection.
• Selectable Laser Modes – Customize detection by selecting pulse rate segments, including stealth-mode laser guns like TRAFFIPATROL XR and LISD.
• X/K & Ka Filter Modes – Multi-level signal filtering to suppress non-police radar interference from other devices.
• Whistler Exclusive Laser Signature ID (LSID) – Displays laser signal Pulses Per Second (PPS) to help identify specific laser sources.
• POP™ Mode Detection – Detects fast, short-duration radar bursts used by certain speed guns.
• Alert Periscopes – Top-mounted LED lights enhance visual alerts without diverting driver attention.
• Selectable Tone Alerts – Choose from distinct tones to easily identify which radar band is being detected.
• 360° Maxx Coverage – Provides complete front, side, and rear radar/laser detection for total awareness.
• 3 City Modes (City, City 1, City 2) – Helps reduce false alerts in densely populated areas.
• High Gain Lens – Expands field of view and boosts detection range for better overall performance.
• Stay Alert™ Feature – Periodically tests driver alertness on long trips to help reduce fatigue-related accidents.
• Dim/Dark Display Modes – Adjust or completely turn off display illumination to suit nighttime driving.
• Quiet/Auto Quiet Modes – Mute alerts when desired, automatically or manually.
• Alert Priority – Highlights the most threatening signal when multiple alerts are received at once.
• Setting Saver – Remembers your preferred settings even when the unit is powered off.
• Selectable Vehicle Battery Saver – Prevents battery drain by enabling custom auto shut-off times.
• VG-2 Detection – Alerts you to the presence of VG-2 radar detector detectors, enhancing stealth.

GT-438XI User Guide