ZPDA (250-3100) AC Adapter Faxback Doc. # 2637 You can use an optional AC adapter with the unit. Use only an adapter with the same voltage rating as the power supply in your area. Plug the AC adapter into a household outlet and then plug the adapter cord into the unit. When you do this, power from the batteries are automatically cut off. - Use only the AC adapter specified below: (Radio Shack 16-2018) or (Casio AD-B60080) The AC adapters output plug polarity must be as follows: Inner Tip = Negative Outer Tip = Positive - The adapter might become warm when it is being used. This is normal and does not indicate any problem. - Be sure to unplug the adapter from the power source when you are not using the unit. - When connecting or disconnecting the adapter, be sure the unit's power is off. - You cannot use the AC adapter when the main batteries are not loaded in the unit. - This adapter is dual polarity. The inner tip is negative, the outer tip positive. (clh-09/21/93)