Bosch BSG81360UC Use And Care Manual page 7

Starting up
Insert the suction hose connector into the suction
opening until it engages.
You must ensure that the plug-in part of the suction
hose connector is inserted into the appliance socket.
Push the handle into the incord telescopic tube until it
engages.
Push the incord telescopic tube into the electric brush
connection piece until it engages.
You must ensure that the plug-in part of the incord
telescopic tube is inserted into the corresponding
recess on the electric brush connection piece.
An electrical contact with the vacuum cleaner is
established when the plug-in part is engaged.
To adjust the length of the incord telescopic tube,
press the sliding lock in the direction of the arrow and
adjust the tube to the required length.