[. . . ] In addition, the general safety notes in the enclosed booklet must be observed. If the cable is damaged while working, do not touch the damaged cable but pull the mains plug. For machines used outdoors, connect to the mains using a fault current (FI) protection switch. [. . . ] H ) Turn the collar of the ring gear exchangeable drill chuck until the tool holder is opened wide enough. Insert the tool and clamp with the drill chuck key 21 uniformly in all three holes. I ) To remove a tool from the ring gear exchangeable drill chuck, turn the collar in the direction of the arrow until the tool can be removed. Take care that the dust protection cap 4 is not damaged when changing tools. Insert the dust-free tool into the tool holder 3 with twisting until it latches. The voltage of the power source must agree with the value given on the nameplate of the machine. To switch off the machine, release the on/off switch 8 or press and then release it. K ) For safety reasons, the machine should be used only with the auxiliary handle 14. By rotating the auxiliary handle 14 to a comfortable position, a fatigue-free and therefore safe working position can be achieved. As a result of the forces that occur, always hold the machine firmly with both hands and provide for a sure footing. Read the value from the scale 22, subtract the desired drilling depth t and set the resulting value on the depth stop scale. N ) With the speed regulator 9, the required highest speed can be pre-set. As a result of this limitation, the on/off switch can be pressed only to the pre-set highest speed. The speed must be selected according to the operating mode, the material to be worked and the diameter of the drill. [. . . ] If the machine should fail despite the care taken in manufacture and testing, repair should be carried out by an authorised customer services agent for Bosch power-tools. For all inquiries and replacement parts ordering, always include the 10-place article number on the nameplate of the machine. We declare under our sole responsibility that this product is in conformity with the following standards or standardization documents: EN 60745 according to the provisions of the directives 89/336/EEC, 98/37/EC. [. . . ]