The emergency flashers are used to warn other drivers when the vehicle has to be stopped in the road due to a breakdown, etc.
Press the switch.
All the turn signal lights will flash.
To turn them off, press the switch once again.

Emergency flashers
If the emergency flashers are used for a long time while the engine is not operating, the battery may discharge.
If your vehicle has to be
stopped in an
emergencyUniform tire quality grading
This information has been prepared in accordance with regulations
issued by the national highway traffic safety administration of the
u.S. Department of transportation.
It provides the purchasers and/or prospective purchasers of toyota
vehicles with information on uniform tire quality grading. ...