Radio Shack Digital Answering System with Caller ID Deluxe and 2.4 GHz Digital Spread Spectrum Cordless Phone - Manual (Page 31)

31 Troubleshooting
CARE
Keep the system dry; if it gets wet, wipe it dry
immediately. Use and store the system only
in normal temperature environments. Handle
the system carefully; do not drop it. Keep the
system away from dust and dirt, and wipe it
with a damp cloth occasionally to keep it
looking new.
Modifying or tampering with the system’s in-
ternal components can cause a malfunction
and might invalidate its warranty and void
your FCC authorization to operate it. If your
system is not performing as it should, take it
to your local RadioShack store for assis-
tance. If the trouble is affecting the telephone
lines, the phone company can ask you to dis-
connect your system until you have resolved
the problem.