View of size 312 battery instruments (Itc, Hs, Fs)
Push-button
(optional)
ITC = In-The-Canal
HS = Half-Shell
FS = Full-Shell
1 or 2 microphone
inlets with O-Cap
microphone filter
Ventilation canal
Volume wheel
(optional)
Push-button
(optional)
Battery door
with nail grip
7b
Sound outlet with
wax filter (ProWax)
Ventilation canal