Which persuasive device is used when an ad says: “free toaster to the first fifty customers”?

i cant see the passage although i do know hyperbole means overly exaggerated such as "i can eat an enter horse"! i hope this you!

answer: yes

explanation: he's doug dimmadome, owner of the dimsdale dimmadome

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,