WORKS WITH VERIZION HD DVR QIP 7216 1, 7100 HD Motorola box ,(WILL NOT WORK WITH QIP 6000 SERIES!!) Pace HD DVR, MVIX 760 HD media player and other Set-top box's. The IR port located on the back panel of the HD DVR Set Top Box will be marked as IR Input. WILL NOT WORK WITH COMCAST DCT MOTOROLA,FIOS QIP 6000 SERIES, or SCIENTIFIC ATLANTA BOXES!!! WILL NOT WORK WITH AV RECEIVERS(Panasonic, Harmon Kardon etc)!!!!! NOTE: This 5V 38KHz unit has been tested with Verizon HD DVR QIP 7216 1, 7100 Motorola cable box used for fios, MVIX 760 HD media player, and PACE HD DVR. Now you can place your cable box behind cabinet doors or other locations up to 9ft away by plugging the 3.5mm plug into the Ir port on the back of the box. When the unit is plugged into the Ir port the Ir signal over rides to only the receiver eye at the end of the cable. Remote control must be pointed toward the round ir receiver in order to change channels etc. unit will perform all functions of the remote control. dark lens makes this unit plasma proof!!!...I am using it placed on my Hitachi 52in plasma screen. This unit should work with any HD DVR, HD STB if the Ir port is active and the port is for a 3.5mm end plug. Please consult with your local cable operator to find out if your box has an active Ir port for a 5V 38KHz Ir receiver cable before placing order.