Panasonic KX-MB2060C Operating Instructions Manual page 112

14. Help
Display
"Requires subscription
to Caller ID."
"Insert battery"
112
Cause & Solution
R You must subscribe to a Call Display service. Once you receive caller
information after subscribing to a Call Display service, this message will not
be displayed.
R A wrong type of battery such as Alkaline or Manganese was inserted. Use
only the rechargeable Ni-MH battery noted on page 7.