Based on sheer numbers alone, it's likely you have at least one Alexa-enabled product in your house. The Amazon Echo Link serves as a bridge between it and your stereo or home theater. It has multiple digital and analog inputs and outputs, letting you control music selection and volume with your voice, with the added bonus of tying into an Alexa-based multi-room music system. If you have a pair of speakers but need power, the Echo Link Amp does all of the above but also has a built-in, two-channel 60W amp for running passive speakers. Its joined in Amazon's audio family by the 3rd-gen Echo Dot, 2nd-gen Echo Plus, and all-new Echo Sub and Echo Input.