If the express isn't the 3700, but is 3900 or 3930, then the answer is yes.
Once you have the wifi voice remote, unplug the power to the express, plug it back in once it stops bouncing press and hold the pairing key in the battery compartment of the voice remote for 3 sec and release, let it finish communicating with the express, it is ok if the light goes out in the battery compartment, wait until you get cofirmation its paired.
Edmund Roku Community Streaming Expert
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