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Calculators: Handheld: Unknown LCD X-CHANGE

Size (actual):

83.5mm x 55.0-60.0mm x 8mm (max)  (w,h,d)
Weight 38g including batteries.
Power: 3.0V DC, 1 x CR2025 Lithium.  It does not accept an adaptor.   Whilst the C/CE key acts as an on switch, there is auto shut down.
Case:

Smooth light grey plastic case with good sized rubbery keys. The two displays (actually one LCD panel) are inset on a wider area of the calculator. The on key has a half raised escutcheon to stop accidental triggering. 

Display: Twin 10 digit (seven segment) and 3 digit (dot matrix) LCD displays
Features: Four standard functions, currency and imperial conversions
Age: 1999
Manufacturer: Unknown, made in China, no serial number
Comments: A useful idea to do multiple conversions as you can see both at the same time. 

Logic comments: Use the (Mode) key to switch between EXCH (currency exchange), CONS (Constant conversions), CALC (normal calculator), SET (change exchange rates).
In Exchange mode use the (/\) and (\/) key to select one of the sixteen currencies and the (X) key to swap the source currency to the top display.  Then use the (/\) and (\/) key to select one of the sixteen currencies for the lower display.  When you type a number in it goes in the top display and (=) puts the conversion in the lower display. The answer can be converted into other currencies by (/\) and (\/) key again.
In Constant mode use in the same way to convert such things as meters to feet/yards, grams to ounces etc.
In SET mode you can change the exchange rates or add new currencies.  Use the (X) key to input a new currency name and (/\) and (\/) key to scroll through the alphabet for three letters.

The Owner's Manual is a single sheet folded to generate 24 pages.  It 300mm by 180mm and is printed in black only with section in English, French, German, Dutch, Swedish, Spanish and Italian. HDKMOEX1114 D25