From the Manufactor
Universal speaker housing for the TCS 16mm x 9mm speaker (included). This simple, closed design channels both the front and rear audio out the front of the speaker housing.
These micro speakers require an enclosure (like this one) or similar to operate effectively.
0.71″ x 0.35″ x 0.26″ or 18mm x 9mm x 6.5mm
1x UNIV-SH5-C Speaker Enclosure
1x 16mm x 9mm WOWSpeaker