About this item Plug and play, just plug straight through Cat 5 or Cat 6 cable into RJ45 connectors and connect receivers with the RCA end. Standard red and white connectors are easily identified on stereo products. Come with 2 packs, 1 for sending and 1 for receiving. Bi-directional stereo to stereo balun are interchangeable. Great for long distance audio transmission, which can either transmit or receive maximum of 240ft cable length. No noticeable signal loss, it eliminates the high frequency losses and hum that may occur when your audio cable is too long. Dimensions: 4.25 x 3.94 x 1.14 inches.