The Psion Organiser was the brand name of a range of Pocket Computer developed by the British company Psion in the 1980s. The Organiser I and Organiser II had a characteristic hard plastic sliding cover protecting a 6x6 keyboard with letters arranged alphabetically.

The Psion Organiser II XP model has a 6303 microprocessor with two-line LCD, two slots for memory cartridges and a connector for expansion. The keyboard is calculator-like with the keys arranged alphabetically. There is no off key the so the machine was switched off by a menu command. The case is also styled like a calculator, but it has a handy slide-on cover to keep the keyboard safe when the machine is not in use. 

Price £139.00
Processor  Hitachi HD6303X /0.92Mhz
Rom  32 kb
Ram  32kb
Power  9v Battery or mains adapter (50µA - 100mA)
Keyboard 36 multifunction keys providing upper and lower case alpha, 10 numeric, 16 operator and punctuation keys and 4 cursor keys.
Expansion Yes
Backlit  No
Size  142 x 78 x 29mm with the protective case closed
Weight  250g (8.8oz)
Screen  Dot matrix based LCD. 2 lines each of 16 characters with 200 character set

Further information can be found at http://www.bioeddie.co.uk/models/psion-ll-organiser-xp.htm