The only Patented Linear-LED® lightheads with a bold look to the future in fire, ambulance and rescue truck emergency lighting. Designed to stand-up to the harsh environments and standards of the industry while providing top of the line performance!

• Surface mounted via two screws.
• Super-LEDs provide unmatched high intensity warning, low current consumption.
• Unique lens shape is completely illuminated with patented Linear-LED® designed reflector assembly, unlike older designs that may have "dead spots" or "hot spots".
• Lens and reflector are a sealed assembly.
• Lighthead is designed with the mounting screws located outside of the sealed lens/reflector assembly eliminating water infiltration.
• Replaceable light engine is accessed from the rear of the lens/reflector assembly.
• Built-on rear gasket insures that the lighthead and optional flange does not touch the vehicle's surface, preventing contact.
• Updated design allows for faster and easier installation.
• M4 lightheads have 129 Scan-Lock™ flash patterns available. Choose from Solid, Left/Right, Top/Bottom, In/Out, or Diagonal sequencing. Meets KKK 1822F, NFPA 1901, SAE and EC65 specifications. 65 flash patterns meet California Title XIII.
• Whelen exclusive "NERM" (Non-Emergency Recognition Mode) is standard. Lightheads glow for instant emergency vehicle identification. Choose from five intensity levels to meet your exact needs.