Part Number: M5133A-100 Description: HDMI to HDMI Cable with built in booster 28 AWG wire v1.3b Rated 100 Feet Category: High Definition Multimedia Interface Price: $185.40

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The ends of our cable are marked "IN" and "OUT". IN=Source, the side with the IN goes to the player or video source (Blue-Ray, etc.).
The booster cable is not recommended for installation inside walls, it is more advisable to put a "passive" cable inside the wall and have the booster as a separate item. Please see our ADP5130 or ADP5133 for a stand-alone model or our WDH681001 for a wall mount insert.
Also please note that some new HDMI displays have booster circuits built into them making the external booster unnecessary.