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Along the way, some calculators were equipped with a voice, or at least a talking function. This could have been for various reasons, gadget, clock combination, or for the hearing impaired.
First one: LED
TSI Telesensory
The most interesting part of this one is the voice. I will try to add a video to this page as this calculator really has the same voice as Stephen Hawking. The button on the top right of the screen serves as On/Off by pulling it, and then as a volume by rotating.
The Ulmost Family
Ultmost made many different Talking Calculators, in several languages.
Panasonic
JE720U and JE721U
Kid's toy
Pikachu