These are Whelen's new Super Linear 400 Series lightheads.  They feature 5 built in scan-lcok flash patterns and are synchronizable with other Whelen lightheads.   They offer a versatile size ideal for bumper, step, or grille mounting. 
These lightheads feature ultra bright output with very low amp draw.  They are designed for heavy duty performance and are vibration, moisture, and corrosion resistant.  Optics and reflectors provide greater light dispersion and offer off angle protection.  Rated for 100,000 hours of operation and with a 5 year heavy duty professional HDP warranty.

FEATURE

• Linear Super LED Lighthead
• Single Level is surface mount or use optional Pedistal Mounts available separately.
• SmartLED Design
• 25 Built-in Flash Patterns
• Phase 1 & Phase 2 Synchronization, plus steady burn
• 3 3/16" H x 4 15/16 W