superspeedusb 3.0high-speed file transfers at 5 gbps - almost ten times faster than usb 2.04 x usb 3.0 portsfully backwards compatible with usb 2.0 and usb 1.1 devicesefficient chargingable to charge four smartphones or tablets (including ipads) simultaneouslyeasy to useplug and playsync-n-go minimizes user wait-timeworks on windows, mac and linux computerssleek and portable designslim and lightweightfits easily in your laptop, backpack or briefcasetechnical specificationsgeneralstandardsusb specification version 3.0 (data rates of up to 5 gbps)ohcixhclusb 1.1usb 2.0usb 3.0interfaces4 downstream usb type a (female) ports1 upstream usb type micro-b (female) portconnectivity rulesup to 127 devicesup to five cascaded hubsmaximum cable length between each hub: 3 mcompatibilitywindows 10/8/win 8 rt/7/vista/xpmac oslinuxphysicaldimensions75 x 51 x 14.5 mm (2.9 x 2.0 x 0.57 inches)weight60 grams (2.12 ounces)powerexternal power adapter 5 v/4 asupplied: maximum 2.4 a per port1 (with external ac adapter)temperatureoperating: 0 to 50? c (32 to 122? f)storage: -20 to 60? c (-4 to 140? f)operating humidity0% to 80% non-condensingcertificationsce fcc