The ability to run Alexa and Google Assistant at the same time on one device is the biggest selling point on the Authentics 300.
JBL Authentics 300 - Retro Style Wireless Home Speaker, Built in Battery (4800mAh), Music Streaming Services via Built-in Wi-Fi, Built in Alexa and Google Assistant
JBL Authentics 300 Portable Smart Home Speaker with Wi-Fi, Bluetooth & Voice Assistants - Noel Leeming
JBL Authentics 300 Review: Hits all the right notes
JBL Authentics 300 review: Retro but smart - Can Buy or Not
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Customer reviews: JBL Authentics 300 - Wireless Home Speaker, Music Streaming Services via Built-in Wi-Fi, Built in Battery, Built in Alexa and Google Assistant
JBL Authentics: The Bonkers 270W Smart Speaker (with both Google & Alexa) Makes Waves at IFA 2023 - Yanko Design
JBL Authentics 300 Portable Smart Home Speaker with Wi-Fi, Bluetooth & Voice Assistants - Noel Leeming
Review: Harman Kardon Go + Play 3 Bluetooth Speaker: A Symphony of Sound and Style – Homecinema Magazine
JBL Authentics 300 review: Alexa and Google Assistant coexisting