Handicare Fortress 1700DT Owner's Manual page 22

lights.
Pressing this switch a second time will turn the lights off.
F Horn
The horn buttons are used to give a warning sound in
dangerous situations.
The horn will sound for as long as you keep the button pressed.
E Jack Key
To switch on the scooter, the jack key has to be inserted into
the jack key receptacle.
All of the Fortress 1700 DT & TA's functions, with the exception
of the hazard lights and the lighting, only operate if the jack key
has been inserted into the receptacle.
The hazard lights and the lighting will always work, even if the
jack key has not been inserted into the jack key receptacle.
G Hazard Lights
Pressing this switch will turn on the hazard lights.
You should use the hazard lights if you fear you will not be seen
by other traffic, or if you are stopped because of a malfunction.
Pressing this switch a second time will switch off the hazard
lights. A beeping sound will activate while the hazard lights are
turned on.
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Fortress 1700 DT/TA