[3] An 1881 letter written by White House disbursing agent William H. Crook refers to an electric bell attached to president James Garfield's desk.
[5] In the 1889 Publication Historic Homes in Washington; its noted men and women by Mary S. Lockwood a story is told about Benjamin Harrison's grandson pushing a call button on the President's desk.
She wrote: Did not little Benjamin, when alone one day in his grandfather's office, climb to his table, and by a touch here and there with his baby hand, set the whole force of secretaries, clerks and messengers on a chase to do his majesty's bidding?
[10] The modern call button sits in an approximately 9 by 3 in (20 by 8 cm) wooden box marked with a golden presidential seal[11][12] and has been on the Resolute desk since at least the George W. Bush presidency.
[14] During Donald Trump's presidencies, when pressed, a signal summons a valet who brings a Diet Coke on a silver platter.