Samsung EB40D - Ferrite Core

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Ferrite Core
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When you connect to the HDMI cable, make sure to coil up the end of the cable on the ferrite core. The ferrite core helps to reduce electromagnetic interference.
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Applicable to the EB48D model only.
A
A: (The distance between the ferrite core and the end of the HDMI cable connected to the HDMI port on the TV) : less than 20mm