Hello Deborah & Welcome to Just Answer,
Sorry to hear of any trouble you may be having in selection a ear phone.
If you are referring to what plugs into the cordless handset: You should select a "headset" (with a microphone).
This is because when you plug something into the cordless handset it "cuts off" the microphone IN that handset.
Also - plugging in a "listen only" set of ear buds (for example) MAY cause to connections to not be properly aligned, so that you would not hear the caller through the ear buds.
If you need a reference for the type of headsets you can use, if you look at the "Accessories" listing in the manual for this system, you will see several item Model numbers listed on the "headset" line. I also have a reference to Amazon, where I did a search for "Panasonic cordless headset", and I see many of the same items listed there. Click the link below to see those search results.
Click here --> http://amzn.to/1MZjUQu
I hope this helps. Please let me know if you have any more questions.
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