EKO Device Eko CORE Manual Del Usuario página 16

Headset alignment
Before placing the eartips in your ears, hold the headset in front
of you with the eartubes pointing away. Once the eartips are in
your ears, they should point forward.
Open the diaphragm
When using a double-sided stethoscope (refer to Figure 3), you
need to open (or index) the bell or diaphragm by rotating the
chestpiece. If the diaphragm is open, the bell will be closed,
preventing sound from coming through the bell, and vice versa.
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Figure 4a
Figure 4b