The next clue

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Across
  1. 3. The best material to make doors out of?
  2. 5. Every computer has it...
Down
  1. 1. Best craft beer company in Tallinn?
  2. 2. Volt x Amp = ????
  3. 3. What will make noice when you say it has to be quite?
  4. 4. What Estonian company makes really nice e-bikes?