I have the main unit.
type handheld computer
country UK
year 1999
os EPOC32
cpu ARM710
speed 36 MHz
ram 8 MB
graphic 640 x 240
colors 16 greyscale
sound beeper
power 2 x AA rechargeable batteries, 10-20 hours of use.
ports serial
The Psion Series 5mx — The Ultimate EPOC Handheld
The Psion Series 5mx, released in 1999, is widely considered the finest handheld computer ever made — a clamshell device with a full-travel keyboard that expanded to nearly full size when opened, running EPOC32 on a 36 MHz ARM710T processor with 16 MB of RAM. Its combination of keyboard quality, battery life (approximately 35 hours on two AA batteries), comprehensive built-in software suite, and the stability of EPOC32 created a device that many professionals used for years after its discontinuation. The 5mx’s keyboard was genuinely touch-typeable — an achievement no subsequent handheld has matched. Psion’s EPOC platform, developed for the Series 5 family, became Symbian OS and powered hundreds of millions of Nokia smartphones throughout the 2000s.