Purchased for use on my APC UPS. The plug is clearly "non-standard" and did not firmly inserted into the connector of the inverter. The mere weight of the cable causes unwanted disconnections. Results: sudden power failures on my NAS even when the cable connects to a device designed to avoid this kind of inconvenience. As usual with this kind of product, I guess you have to buy more before having the chance of getting a good copy. To be continued ...