📉 Micro Bitcoin mining devices may not be profitable, but their developers consider them important in combating the "secrecy and exclusivity" of the mining industry.

- Open and pocket micro-miners are available as ready-made devices and kits for self-assembly.

- BitMaker offers a portable miner for $3 with an output of 50 kilos per second.

- The developers note that all known Bitcoin ASIC miners are closed, which limits the production and supply of miners.

- Open source micro-miners promote transparency and accessibility of the industry to the general public.