The Cobra RAD 400 keeps drivers aware of their surroundings while protecting them against all radar and laser guns used today. Anti-Falsing Circuitry & Updateable IVT Filters (In-Vehicle Technology) not only reduces false alerts from blind spot systems and traffic flow monitoring devices, but also eliminates erroneous alerts from sources like collision avoidance systems, so users hear just what they need to hear. The bright, easy-to-read display and VoiceAlert provide intuitive band identification and easy-to-understand alerts for an accurate and informed drive. The RAD 400 comes pre-programmed for both English & Spanish voice and text alerts.