azon-is-working-on-a-portable-echo/">as rumored</a>, a smaller portable version of the Echo—6.2 inches tall and 2.6 inches in diameter—complete with a rechargeable battery and charging cradle (you can also charge it via micro-USB). Despite sharing most of its siblings&#8217; capabilities, though, it lacks one significant feature: you can&#8217;t address it by saying &#8220;Alexa&#8221;; instead, like a pre-6s iPhone, you need to tap a button on the side to trigger the voice assistant. Amazon says the ba