Lambretta DUE50 Owner's Manual page 25

Turn Signal Switch
Move the switch to the right to activate the right turn indicator.
Move the switch to the left to activate the left turn indicator.
Press the white button in the middle to turn off the turn indicator.
Notes:
Always signal your turns and other maneuvers as required by law.
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Unlike a car, the turn signal must always be cancelled manually on a scooter. Always
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remember to turn off your signal after the maneuver is completed.
Horn Button
With the ignition in the "ON" position, press the horn button to sound the horn.