AVOID RETURNS: USE ONLY WITH CABLE BOXES WITH AN ACTIVE IR IN PORT LABELED IR IN OR EXT. IR LOCATED ON THE BACK OF THE CABLE BOX. If the lbox is listed as compatible but does not work when plugged in try unplugging the power from the cable box for 30 seconds while keeping the receiver plugged into the back of the box. The box will reboot.All units are bench tested and working before leaving the factory. | Works with VERIZON FiOS, Comcast, Scientific Atlanta Explorer,Cisco,PACE,Motorola,Arris, and DTA Set Top Boxes Will NOT work with SA 4000HDC series,4200/HDC,4240,4250/HDC,8300/HD,8240/8260HDC box, A/V Receivers,TVs or IR Repeater kits | LOOK AT SIDE PICTURES TO COMPARE SIZE OF COMPETITORS. Ours is only 1/2in wide. Thinnest available! Perfect size to blend into current flat screen frames.Hide your cable box in a cabinet, down in the basement or A/V rack or room using this small (.53 wide x 1.12 long x .43i tall )IR receiver with 9 ft lead to 3.5mm gold stereo plug. | REPLACES Cisco/Scientific Atlanta IR Extender 1004648,4029013,4022323 | 23 Years Experience Manufacturing And Supplying The Cable And Hotel Industry