Preethi bluberry is the latest type of grinder with varieties of jars. It includes 3 type of jars which includes (1.5 liters) wet grinding Jar, chutney jar (0.5 liters), turbo mini spice jar (0.2 liters). The Turbovent Technology has the power for faster cooling of motor. For a better speed control it has a rotary switch control which enhances the speed up to 1, 2 and 3 as desired. If the jar is overloaded and stops, there is a red knob under the unit, remove some of the material, lift the unit and press the red knob and restart the mixer, this works as an “overload protector”. The shock proof ABS body with heat sensitive cutoff for protection against voltage fluctuation and overload.