Simultaneous4Ports: ThislaptopUSBportexpanderprovidesstableperformancefor4portsworkingsimultaneouslywithoutanystressandkeepingthetemperaturewithinamoderaterange OutstandingCompatibility:4-PortUSBHubforavarietyofdevices: laptops, PCs, cardreaders, harddrives, cellphoneOTGadapters, etc EasytoUse: Plugandplay, USB0hubsareautomaticallyrecognizedbymostoperatingsystemNoexternalpowersupplyordriverisrequiredOurhubsdonotinterferewithsignals UltraSlimandPortable: Ultraslimdesignforlaptop, smallenoughtobefunctionalwithouttakinguptonsofspace, agoodhelperforhome, office, businesstriporanywhereyougo