I bought this HDMI range extender to boost a camera and camcorder signal over a 20m HDMI cable. Without the booster I could not get a stable video signal (or any signal) at a video switch (an ATEM Mini Pro) that is located at the back of a hall away from the cameras. I suppose I should be pleased that the boosters worked but they did not work in the way expected. Strangely I found they worked best when they were at the video switch end and not the camera/camcorder end. So rather than working as a "booster" they were working rather better as a more sensitive pickup than the ATEM video switcher. A bit surprised and confused, but there you go.