RM5500B pressure washer with gasoline motor, but you also could choose an electric engine starter, easily for starting the machine and begining to working, the big working pressure is convenient for cleaning the big trucks, planes, buildings, factories, farms etc, five different color kinds of nozzles offer different working water spray, the red one is 0° , the yellow one is 15° , the green one is 25° , the white one is 40° , the black one is 84° , the working pressure is adjusted for high to low with different water spray for 0° To 84°