... proof User Interface, and Easy-Going Remote ControlTwin Tuner PVR, Watching One Channel while Recording Another ChannelTransportation Stream Recording ... CIUSB Port USB 2.0 Port for Multimedia Player,PVR and Software Upgrade/BackupRear PanelINPUT1Receives the Signal from Satellite ... OutputUSB Port USB 2.0 Port for Multimedia Player,PVR and Software Upgrade/BackupRS232 PortSerial Port for Software ...