A modern fire truck is usually a multi-purpose vehicle carrying paid firefighters or volunteers and equipment for a wide range of firefighting and rescue tasks. Therefore, most fire truck carry equipment such as ladders, pike poles, axes and cutting equipment, bars, fire extinguishers, ventilating equipment, floodlights, hose ramps, self-contained breathing apparatus (SCBA), and general tools. Many fire appliances are based on standard truck or lorry models with heavy duty suspensions, brakes, tires, alternator, transmission and cooling systems; audible and visual warnings such as sirens, horns, and flashing lights; and a two-way radio.