3.5mm 1.35mm should be the right size for the computer side of the HTC Vive Communications Box, but this cable doesn't quite fit. Please note that I am talking about a communication unit and not base stations (beacons). The pin end fits perfectly in the communication box. However, the cord coming from the power adapter doesn't quite fit the socket on this extension cord. I can barely get it halfway in with some force and it makes an electrical connection, but it leaves the barrel open and I'm not inclined to trust the connection. Otherwise it appears to be a perfectly twisted cable. I don't know who is responsible for the loose tolerances, so your mileage may vary.
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