The Sonos One is probably the latest first party smart speakers available to the market currently. It's the second generation of first party speakers that ended up released by Sonos in early 2017. That said, be careful when looking at battery specs, as they regularly list a highest runtime https://www.bluetoothspeaker.top/factory-price-wireless-bluetooth-speaker-waterproof-with-usb-tf-tws-function/