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(adaptor is not included) When to Change the Battery When the battery is used up, " " indicator flashes in the display. Replace all the batteries with new alkaline batteries. Note: Do not mix new batteries with old one. Do not use different types of batteries together. Using an AC Power Adapter (Not included) 1. Insert the adapter plug into the DC input jack on the unit. 2. Plug the adapter into the AC wall outlet. 3. Unplug from wall outlet when not in use. Note: Use only a 4.5V DC , 500 mA Ada