Thank you for having the manual I needed for an older model Aiwa stero I had found on Ebay --- I wanted the Aiwa because I had tapes and cd's but I did not have a manual as to how to operate the system... I found what I needed and it has enabled me to set the system up for my enjoyment.
I wished detailed information of the JBL S310 and here I found it! Very happy with the service from this site!
Text excerpt from page 64 (click to view)
Belt Clip
You can hang the handset on your belt or pocket using the included belt clip.
To attach the belt clip
To remove the belt clip
Shoulder Rest Attachment
Use the shoulder rest attachment if you need to keep your hands free during a phone conversation.
To attach the shoulder rest attachment
Attach the included belt clip to the handset (see above), then attach the shoulder rest attachment to the belt clip as shown below. You will hear a click when the shoulder rest attachment is in place.
To remove the shoulder rest attachment
Slide the base of the attachment in the direction of the arrow as shown below.