oticon alta Instructions For Use Manual page 7

Instrument view miniBTe with corda miniFit (thin tube)
Your ear piece
Corda Mold
Domes:
Type
Open
Power
Bass, single vent
Bass, double vent
Battery size: 312
Size
6 mm
8 mm
10 mm
12 mm
7a
Microphone openings
Thin tube
Ear grip
(optional)
Push-button
Battery door