Cel-Fi PRO X is a cable adapter sleeve that allows the Cel-Fi PRO unit to link across greater distances or through (RF blocking) obstacles. The accessory works with any Cel-Fi PRO, in locations where the standard wireless UNII system link is challenged. The Cel-Fi PRO X connects the Cel-Fi PRO Network Unit to the Cel-Fi PRO Coverage Unit using a completely passively coupled sleeve, which uses the cable for communications.

Cel-Fi PRO X opens up new opportunities for using Cel-Fi PRO Smart Boosters, when other solutions fail. Cel-Fi PRO X enables cellular coverage to hard to reach places by allowing the Cel-Fi Coverage Unit to be placed much further from the Network Unit, or allowing the Units to connect when their normal RF link signals cannot penetrate through structures.