Hitachi SH-G1000 - Manual (Page 44)

Section 2: Understanding Your Device
36 2A: Your PCS Phone – The Basics
Using the Optional Headset
Ⅵ To connect an optional headset to this device, insert the plug on the
headset into the headset jack on the device.
Note: Insert the headset plug into the jack as far as it goes. Incomplete
connection of the headset plug can result in abnormal sounds.
Note: When using headphones with a 3.5 mm (1/8 inches) stereo phone
plug, use the supplied stereo mini plug adapter. You must not use an
adapter other than the supplied one.
Note: When using the headset or headphones, be careful not to increase
the volume too much.
Note: Audio volume differs depending on data to be played back. If the
volume control has been set to the maximum level, unexpected
excessive volume may damage your ears. Before playing back data, set
the volume control to the minimum level, and then gradually increase the
volume to the appropriate level.
Headset Jack