6 x Clip On EMI RFI Noise Ferrite Core Filter for 7mm Cable
<br />Helps reduce EMI on AC power lines.
<br />*Black plastic enclosed ferrite core for 7mm AC power cords.
<br />*Great for cutting noise on USB, Firewire, Phone, Power Cord, Coaxial, Audio, Video etc cables.
<br />*Easy Structure and convenient installtion.
<br />*Just clip it on and you will get clearer signal and faster data transmission.