VDO Cyclecomputing C1DS Instruction Manual page 10

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IMPORTANT!
This information will help you understand how the digital transmission of your
VDO computer works. You really must follow the initial set-up steps in the order
described below.
ATTENTION:
At a break during your ride the receiver will be switched off after 30 minutes
(battery consumption). Before continuing your ride you need to switch on the
receiver again = press M-button
IMPORTANT HINT for cell (mobile) phone brackets on the handlebar.
The digital wireless transmission of you VDO DS computer is likely
to be disturbed if you are operating a cell (mobile) phone too close
to the computer. We highly recommend not mounting your phone on
the handlebar.
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