Hi Guys, sorry for the slow reply.

A new hardware revision of the A3 model (v105) comes with a noise pollution sensor. This cannot be used to record voice, as it is limited to just a few samples per minute (Voice goes in the kHz range, that means a few thousands of samples per second).

The noise pollution is a critical issue in cities, affecting life quality directly, this is why we need to address it as well.

as for the other questions:
“The Homepage shows Voice as Chooseable Sensor but no Data.”
The option is called “Noise”, not voice.
The selector is generic and it applies to the entire network, regardless of the those that don’t have a particular parameter (those will appear as black squares).

“Wy is the Option shown if there is no such Sensor in my Device?”
Later A3 devices will all have the noise pollution sensor. The option was added in software, however older A3 units won’t be able to serve this data.