Tripp Lite 4-Port Rugged Industrial USB 2.0 Hi-Speed Hub w 15KV ESD Immunity and metal case, Mountable(U223-004-IND) Industrial-grade, rugged all metal 4-port USB hub Supports USB 1.1 and 2.0 transfer speeds ( 12 - 480mbps ) Wall or Din Rail mountable - hardware included Bus Powered or optional 3-Wire DC Terminal Block ESD protected to  15kV 2-year limited warranty Plug-and-Play; no software or drivers