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@Richard Speed - Nice photo! :)

Are it's lithium ion batteries user replaceable? That's what I hate about wireless headphones - unless they use mass produced and easy to buy lithium ion battery packs or cells of a generic form factor, you're out of luck in a handful of years (if you're lucky) after which it becomes landfill... adding to mountains of e-waste destroying us all. Does Logitech install sabotageware, to prevent repairs as Bosch (to) do in their ebike batteries? This class of product and it's ilk, is just fast-fashionable tech. My 20 year old mp3 player died last year, but because it used a bog standard lithium battery pack which was cheap to buy on AliExpress, and easy to solder in, it lives a little longer. It's a truly terrible mp3 player, but remains useful in my shed's background music to enhance interest in gardening activity sound system (Vamp amped old speakers with cheap generic lithium batteries). Things don't get dug, unless I hear things I dig. I can't wait for sodium ion batteries to become available.