Motorola Pageboy was the second pager ever produced by Motorola with individual-unit addressing,[clarification needed] after the less known 1955 (not 1956 as believed) Pager called "Handie-Talkie Radio Pocket Pager".[citation needed]
The first pager-like system was used in 1921 by the Detroit
Police Department. However, the first pager that we would today
recognize as such was Motorola's Pageboy I.[citation needed]
It was introduced in 1964 by the company and could selectively
deliver a radio message to a particular individual. It used a high-band
VHF frequency (from 150 to 170 MHz), or a UHF frequency (from 464 to 475
MHz), and they ran on a rechargeable 4.4 Volt mercury or 3.6 Volt
nickel-cadmium battery (NiCd).[citation needed]
The first implementation of the Pageboy alarm receiver could only
give an attention tone, had no display and could not store messages.
However, it was portable and notified the wearer that a message had been
sent. Later versions of the Pageboy were able to deliver tone &
voice.[citation needed]
The Motorola Pageboy used to be very popular with fire brigades
as an alarm receiver and, thanks largely to the success of this initial
venture, pagers quickly began to replace public announcement systems in
hospital and factories. The pager was activated by a 2-tone code, after
which a voice message was transmitted. The successor of this device was
the Motorola Pageboy II.[citation needed]
Thanks to: http://www.wikiwand.com/en/Motorola_Pageboy