The Amazon Tap is much smaller than the Echo.
You must press the mic button to signal the unit you are going to speak to it.
Located on the back the panel houses a power button, headphone jack, microUSB charging port, and the Bluetooth pairing button.
The top of the Tap has five buttons for controlling the playing of media.
The Tap fits comfortably in the hand.
The Amazon Tap can be charged by plugging the microUSB cable directly into the unit or by placing it in the included charging cradle. These contacts charge the device in the cradle.