Difference between Roku Wireless Subwoofer and Roku Wireless Bass Pro

I wanted to buy a Wireless bass Pro but instead got a Roku Wireless Subwoofer.. Cost for both of them is same $179. But I wanted to know the difference . The Wireless Bass Pro can be seen in the Roku website , whereas in Walmart or Amazon I see Roku Wireless Subwoofer. From configuration side they look pretty much same. So wanted to understand the difference.