StarTech.com 2 Port Low Profile 12V 24V PoweredUSB Adapter Card - PlusPower (PUSBADAPLP) Connects to a Powered USB Main Board or a mother board of a PC using an extension cable Supports extra powered USB ports with different voltages Connector locking mechanism prevents cables from being unplugged accidentally Connect to a Powered USB Main Board or a mother board of a PC using an extension cable Doesn't require a PCI slot Provides 2 powered USB ports that supply 24v and 12v power. Provides 3Amp of current for each port 4 pin Din connector acts as an optional external 24v AC adapter