... .Auto flash 3.Used in Storage battery car widely 4.With siren and speaker High-brightness LED lightbars, Police lightbars, warning ... Strobe Light Bars for police car, ambulance, pursuit car. Matched with Siren and Speaker.1. Available in various colors.2. Fully-sealed ... dome, hard to crack and high anti distortion ability, electroplated with crystal, hard to fade.6. Install speaker inside or outside ...