Sennheiser l2013 - Manual (Page 9)

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Connecting to form
larger systems
If several systems are to be operated
simultaneously, it is recommended
that the corresponding charging
units be connected in series.
To do this the screws (S) are
unscrewed from the base, the
connecting rails (V) are removed
and then resecured with the screws
so that the units are permanently
connected to each other. The power
supply flows from one charger to
the next via the connecting rails (V).
One Power Supply Unit NT 2013
is sufficient for 5 Dual Charging
Units L 2013.
Wall mounting
The charger is prepared for wall
mounting. The correct slots (M) are
located on the back side.