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1: Introduction
DoubleCheck XL is a commercial calculator with extra large buttons and a huge
display with big digits as well. With the backlit display and the speech output as
optional functions, DoubleCheck XL is especially suitable for visually impaired and
blind people.
1.1: Quick Overview on the Functions of DoubleCheck XL
Spoken functions with natural voice
Extra large display with 10 digits of 2.5 cm (1 in) height
Extra large buttons, size: 1.5 x 1.5 cm (0.6 x 0.6 in)
10 memory spaces
Reciprocal value
Percentages
Square, raise to higher power and extract roots
Calculation of compound interest, cash values and annuities
Conversion of currency and physical units
Date and time with alarm clock function
Volume control in 6 steps
1.2: XL Product Series
XL calculators are available in the following versions:
Non talking
Non talking, with backlit display
Talking
Talking and with backlit display
2: Description and Scope of Delivery
Included in the delivery are the commercial calculator DoubleCheck XL, a set of
batteries (4 x 1.5 V AA) and a printed user manual. A power supply unit and
earphones can be ordered optionally.
Please note that for non talking and/or backlit display versions
not all keys functions are available.
Consult instructions before use!
Do not operate
DoubleCheck XL without reading the instruction manual. Get
acquainted with the device and all the accessories. Keep the
instruction for reference reading and pass it on with the device.
Summary of Contents for DoubleCheck
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