This is an inductive buzzer meaning that is will act as a short to ground if you are not actively driving it.
We recommend you put both I/O pins to low (0V) when the buzzer is not used.
Also, it's come to our attention that washing these buzzers will damage them. Until we've figured out a solution to this, avoid washing any portion of your project that contains one of these buzzers.
Dimensions:20mm outer diameter. Thin 0.8mm PCB