A total of 2 reviews of this product on Reddit.
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I wanna say yes, try this one
Has a battery included
DIY Bluetooth Speaker Cube Kit | Build Your Own Portable Wood Case Bluetooth Speakers | Perfect for STEM Curriculum https://www.amazon.com/dp/B01IPNGZ52/ref=cm_sw_r_cp_api_glt_fabc_VAHHH2TDQN60SNBQ7DY6
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to my knowledge, this may not even require a raspberry pi. it could be achieved with a bluetooth audio board, speaker rated for the audio board, & mic rated for the audio board. could be battery & use a battery & charge board, or usb & directly wire usb to bluetooth power in.
Amazon link to a diy product like you described. owned it at one point, repurposed it, unsure about mic function, no external control buttons
DIY Bluetooth Speaker Cube Kit | Build Your Own Portable Wood Case Bluetooth Speakers | Perfect for STEM Curriculum https://www.amazon.com/dp/B01IPNGZ52/ref=cm_sw_r_cp_api_i_3pzMCbC2FG22C
