Whelen Engineering 2012 Series RapidFire Strobe Beacon - Magnetic Mount, Model# 2015HPAM SAE Class 2 certified 12 &amp; 24V DC capable Fully enclosed, rugged polycarbonate base protects against moisture and vibration Shatter-resistant polycarbonate dome with state-of-the-art lens optics Reverse polarity protection; easy-access modular replacement design