Xumo Number buttons for Xfinity Stream App

Hello, I am hoping someone knowledgeable can answer this question for me. Once I am in the Xfinity Stream App using the Xumo Stream Box, can the number buttons be used to find and select the different channels, that is, channel 702, etc.? I have a Roku streaming device using the Xfinity Stream App, and all I can do is find and select a channel, but I cannot select a channel using voice command. The Amazon Fire TV behaves in the same manner. I am trying to decide if the Xumo Stream Box is worth the cost. We have X1 TV with 2 Cloud DVR's, & 4 X1 STBs. Maybe eliminate the 4 STBs and use the Xfinity Stream instead with Xumo, Roku, or Amazon Fire TV. Any help would be greatly appreciated.