Version 0.3
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11. 3.5mm Headset connector
12. Volume Up key (side key)
13. Volume Down Key (side key)
14. Mute key (side key)
15. External Speaker
16. Battery
17. Strap Hole
Tone Type and Volume
Frequency definition
A
440 Hz
G
659 Hz
M
Hz
S
Hz
B
622 Hz
H
Hz
N
Hz
T
Hz
