The Whelen Ion is one of their newer generation and most popular products for exterior perimeter warning lights. With 6 high intensity LEDs and an optic lens, it is very effective while still being compact in size. It can be mounted a variety of ways.
 
Wiring: 12V DC; power, ground, Scan Lock pattern change
Mounting: Screws not included
Condition: Refurbished/Good or Damaged (select option; discounted price) sold as-is
Damage description (if option selected): One screw hole with stuck stripped screw, re-drilled hole, may require modification to mount, does not effect light output