My sister moved to an apartment building where a "stale" satellite system was installed. The following problem has occurred: The "SAT-box" is a voltage at which the new Panasonic TV my sister not "tolerate" un has therefore refused to display the picture. After a long search on the Internet I found a reference to a DC blocker. Since I did not want to spend 20 directly I decided for this one. This DC blocker is favorable, well made and finished its purpose properly. Immediately after we clamped between this part everything went smoothly.