COB LED CHIPS TO UPGRADE LUMINANCES - Front and back total of 8 COB and two side total have 8 LEDs. The specifically COB LED designed to uniform light display, wider 360° coverage viewing angle than normal Led lights bar, increased visibility and enhance driving security. 21 STROBE FLASHING PATTERNS - From alternating and directional patterns, and many more to choose from. Including last pattern memory recall. It is great for emergency vehicles, construction sites, postal service, snowplow, trucks, tractor, security, etc. HIGH QUALITY & WATERPROOF - Made of durable and corrosion-resistant aluminum alloy materials with encapsulated electronics. Able to withstand rain, snow, and other harsh weather conditions. Moisture and vibration resistant. SIMPLE INSTALLATION - Easily installs on any metal roof top with 4 heavy-duty magnetic mounts with protective rubber feet. Stainless steel bracket, Strong and Lightweight. Cable can be wrapped around the magnet supports for clean storage. CONVENIENT DUAL SWITCH DESIGN - Handy power switch to turn on and off, the second switch is to change between 21 different flash patterns. Includes a 16 FT straight cable with a 12V cigarette plug.