Sanyo S1 - Manual (Page 12)

15. Side Volume Key allows you to adjust the ringer volume in
standby mode or adjust the voice volume during a call. To
mute the ringer during an incoming call, press the volume key
up or down. The volume key can also be used to scroll up or
down to navigate through the different menu options.
16. Side SPEAKER Key lets you place or receive calls in
speakerphone mode.
17. Speaker lets you hear different ringers and sounds. The
speaker also lets you hear the caller’s voice in speakerphone
mode.
18. Charger Jack connects the phone to the phone charger
(included) or an optional USB Cable.
19. Headset Jack allows you to plug in an optional monaural
headset for convenient, hands-free conversations.
CAUTION! Inserting an accessory into the incorrect jack may
damage the phone.
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