Double Insulation: An electrical appliance that is double insulated does not have an earth wire fitted. The appliance is designed in such a way that the electrical parts can never come into contact with the outer casing of the device.
Variable Speed: Drills usually have a variable speed trigger, meaning that the harder you squeeze, the faster the electric motor spins the driveshaft. Cheaper models run at a single top speed, but pricier models offer between two and four maximum speed settings.
Forward Reversing: The machine has a forward and reverse control. It's a sliding switch that indicates and changes the direction a machine is driving depending on which way it is pressed.
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