There are other ways to use Alexa without the Echo speaker.
Alexa App
Download the free Alexa app to your iPhone or Android device.
Sign in with your Amazon account.
Tap and hold the icon in the footer bar to speak to Alexa.
Reverb for Amazon Alexa
Download the free Reverb for Amazon Alexa app to your iPhone or Android device.
Sign in with your Amazon account.
Tap and hold within the blue ring to speak to Alexa.
Echosim.io
Open Echosim.io in your browser.
Sign in with your Amazon account.
Tap and hold the microphone to speak to Alexa.
Amazon Fire Tablet
In settings, go to Device > tap Alexa > choose options to enable, with or without Hands-Free, and select the Wake Word