An experienced arduino designer is required for designing a device:
We need a compact voice recorder with an integrated stopwatch.
The recorder shall be able to record audio and time simultaneously; while recording, if a certain button is pressed the time on the stopwatch shall be stored in a file on the microSD card.
The recorded file shall be a .wav or .mp3 file.
Allowed time drift: 0.01%.
Operational battery life >2h.