It's been about a year since Sonos released the Roam, the company's smallest and least expensive speaker yet. As with most modern Sonos speakers, the Roam has a built-in microphone that lets you use the speaker with Amazon's Alexa or the Google Assistant. Today, Sonos is releasing a variant of the Roam that omits that microphone, the Roam SL. Aside from removing the microphone, the $159 Roam SL is identical to the original Roam, which costs $20 more. It's a small speaker that can connect to your WiFi network and be part of a Sonos multi-room audio system. But it also has a built-in battery and Bluetooth capabilities, so you can take it with you and use it away from a WiFi connection.