●Do not insert any modules other than the optional SFP modules(PN54021K/PN54023K) into the SFP extension slot.Deviation could lead to fire, electric shock, and/or equipment failure.For the latest information about compatible SFP extension modules,check our website.●Do not please this Switching Hub in harsh environment (such as nearwater, high humid, and/or high dust).Deviation could lead to fire, electric shock, and/or equipment failure.●Do not place this Switching Hub under direct sunlight and/or high tem-perature.Deviation could lead to high internal temperature and fire.●Do not install any module other than the separately sold SFP module(PN54021K/PN54023K) to SFP extension slot.Deviation could lead to fire, electric shock, and/or equipment failure.●Do not install this Switching Hub at the location with continuous vibra-tion or strong shock, or at the unstable location.Deviation could lead to injury and/or equipment failure.●Do not put this Switching Hub into fire.Deviation could lead to explosion and/or fire.●Do not use the bundled power cord for anything other than this prod-uct.Deviation could lead to fire, electric shock, and/or equipment failure.4