4 Speakers Amazon Recommends Using With the Echo Dot
Amazon.com: DOSS [Upgrade] E-go Alexa-Enabled Portable Bluetooth Speaker with Superior Sound, 33ft Bluetooth Range, Built-in Mic, Ultra-Portable Design, IPX6 Waterproof for Home and Outdoor : Electronics
Amazon.com: Made for Amazon Extension Cable, 10' (3M) Length in White, for Echo (4th Gen) : Amazon Devices & Accessories
How to Connect an Echo Dot to Another Speaker (Step by Step)
Pump Up the Jam: How to Connect Your Amazon Echo to an External Speaker | PCMag