FOCUS Enhancements 3.2 - Manual (Page 7)

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Class A Warning (EN55024, EN55022)
In a domestic environment this product may cause radio
interference in which case the user may be required to take
adequate measures.
WARNING
Failure to provide adequate surge protection may
cause damage to the Firefly.
Visual Circuits does not warranty damage caused by
electrical surges to the system. Surge protection should
be provided when connecting any peripheral device and
power to the system.