Description Enclosed ferrite core for AC power cords. Great for cutting noise on USB, , phone, power cord, coaxial, audio, video cables, etc. Simple, convenient, effective and small. Good performance, high efficiency, long life. Put it closer to where the electromagnetic source is, the more effectively improve the signal quality of audio and video. Features - Color: Black. - Material: Nickel zinc ferrite. - Size: 16.40 x 5.80 x 1.80cm/ 6.45 x 2.28 x 0.71 inch. - With inner self-adaption clip can mount on cables tightly and work for a super long time. - It can improve the electromagnetic field around the solenoid, thus avoiding outside interference. - Ferrite core with plastic cover. Helps to reduce electro magnetic interference on AC power lines. - Easy to install and convenient to use. The cylinder can be dismountable, and the port has the elastic clip fastener. - This noise suppressor can be widely used on a variety of data cables. With inner self-adaption clip can mount on cable tightly and work for a super long time. It can improve the electromagnetic field around the solenoid, thus avoiding outside interference. Ferrite core with plastic cover. Helps to reduce electro magnetic interference on AC power lines. Easy to install and convenient to use. The cylinder can be dismountable, and the port has the elastic clip fastener. This noise suppressor can be widely used on a variety of data cables.