Picture Dial Speakerphone, 40dB, large button phone can replace numbers with 1" x 1.5" pictures for 10 one-touch photo dialing buttons, as well as a red 911 emergency key. A toggle switch can also be used to force picture dialing only. This is a great feature for people with dementia or reckless dialing habits. Phone includes amplification up to 40dB, as well as a 2 way speakerphone with 4 level volume control. All memory features are saved even if the unit is unplugged from the line. No AC or batteries required.