Piezoelectric Sounders FAQQIs there any rule for mounting direction?

Following products have rule for mounting direction.

PKMCS1818E20*
PKM17EPP-20*
PKB*

The other sounders except for the above don’t have rule.

For the products having rule
⊕ marking (Pole display) is printed on their top.
Terminal of ⊕ marking side should be connected to hot side of D.C. plus.
Sounder

※Case of mounting reverse direction

PKMCS1818E20*, PKM17EPP-20* ： Characteristics could be degraded
PKB*： No sound

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