Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Thank you for your manual It has the basic things to and i use the Oszi for Longer Time.
THX
Text excerpt from page 13 (click to view)
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Using the Belt Clip
You can hang the handset on your belt or pocket using the belt clip.
To attach the belt clip
To remove the belt clip
Using an Optional Headset
Plugging an optional headset into the handset allows a hands-free phone conversation. Please use only a Panasonic KX-TCA87 or KX-TCA90 headset. To order, call the accessories telephone number on page 2.
Connecting an optional headset to the handset
Open the headset jack cover, and connect an optional headset to the headset jack as shown below.
The illustration headset is a KX-TCA90.
Preparation
Headset Jack
When an optional headset is connected to the handset, make sure to use the headset to talk with the caller. If you want to have a normal cordless phone conversation, disconnect the headset.