42 high power LED micro strobe warning bar, permanent mount. 12V/24V, 24 flash pattern. SAE J845 Class 1. Amber LED with amber lens. Hardwired with 3 wires; red to VDC, black to chassis/ground, blue for flash patterns and synchronization. To change flash pattern, momentarily apply red wire to blue wire. Connect blue wires of all minibars together for synchronization. 15-3/4"L x 6-3/4"W x 1-1/4"H