Filters use optical data diodes to restrict the data flow to one direction, preventing the ability to copy sensitive data from the computer or server. USB emulation logic emulates keyboard keystrokes, thwarting malware from being injected into the protected asset. The Belkin HID black fixed filter eliminates sophisticated cyberattacks while allowing HID keyboards and mice to connect and operate*. Like our USB blockers, these filters use a permanent USB Type-A connector that can’t be removed from the device without damaging the computer and the USB port.