Whelen Engineering Company, Inc.
5 years warranty

Available in multiple mounting options and in high or low dome models, L21 beacons are durable and suitable for numerous applications.

  • Synchronizable with other Whelen sync products
  • Polycarbonate base
  • Full reverse polarity protection
  • Hard-coated domes
  • Fully encapsulated for moisture, vibration, and corrosion resistance
  • SmartLED® beacon design
  • Rated for thousands of hours of use
  • Virtually no RFI/EMI radiation

Permanent Mount Models:

  • Combination mounting: 1” pipe/permanent
  • Synchronize with up to eight Whelen beacons
  • Photocell Hi/Low mode available, contact factory

Magnetic & Magnetic/Suction Mount Models:

  • 80 lb. magnetic mounting base
  • 75 SignalAlert™ flashes per minute standard

WARNING: These products may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit whelen.com/regulatory.



Low dome: 5-5/16” (134mm) H x 6-7/16” (163mm) Dia.

High dome: 6-13/16” (172mm) H x 6-7/16” (163mm) Dia.


Voltage 12.8 VDC
Amps Low amp draw: 1.5 amp (peak), 0.6 amp (average)

Low amp draw: 0.65 amp (peak), 0.26 amp (average)*  

Electronics 100% solid-state
Flash Patterns 25 Scan-Lock™ patterns

Including steady-burn

Certifications SAE Class 1 (Amber)
Warranty Five year warranty

* Magnetic & Magnetic/Suction Mount models


Mount options Permanent


Magnetic/suction mount

Dome Option High


Colors* Amber