Why is there a sticker that says "remove seal after washing"?

In manufacture of PCBs they wash excess flux off after reflow soldering. This sticker reminds them to remove it as it blocks openings while the board is washed.

Active buzzers like this are rated at around 85dB minimum.

will this make any sound if powered by lower volt like, 1.5v or 3v?

The one I quickly tested seemed to trigger at about 3.5V, operates at about 3.4V, and fades to off within a drop of .1 or .2. YMMV

What is the diameter and height?

I measured .37h x .47d with a range of about .02 in inches

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