Technical SupportIf you need any assistance to get your unit functioning properly, please have yourproduct information ready and contact Addonics Technical Support at:Hours: 8:30 am - 6:00 pm PSTPhone: 408-453-6212Email: http://www.addonics.com/support/query/T E C H N O L O G I E Swww.addonics.comUser Guide4-Port External USB HUB(AD4U3HE, AD4U3HEP)