A quick PSA for anyone on the fence about picking up an Amazon Echo: The Amazon Tap has officially started shipping in the US. It’s available for $130.For the uninitiated, the Tap is a more portable version of Amazon’s popular smart speaker. It has access to the same Alexa virtual assistant found on the Echo, except it’s totally wireless, built along the lines of more traditional Bluetooth speakers like the JBL Flip 3 or UE Boom 2. Because it’s portable, the Tap has you activate Alexa through a microphone button on its front, instead of utilizing the Echo’s always-on voice recognition tech. Amazon says this change is to help preserve the Tap’s battery, which it says will survive 9 hours of audio playback.