The waterproof functionality doesn't come at the expense of the sound, either, with the Aquaris sporting high-definition sound with 48 channels with high frequency resolution and a 12 kHz frequency range.

ENGADGET: Siemens' waterproof Aquaris hearing aid means rain doesn't need to stop play, we go ears on

High resolution is achieved by measuring motion rather than radio frequency signals as wifi does, and is based on where and how the person moves through an environment over time.

BBC: Technology that works behind closed doors