The G2 update was made available to Nuraphone users in July 2018. Most new Nuraphone headphones come with these already features pre-installed. If you do not have access to the following features though, please update your Nuraphone.
G2 Features:

Even quieter listening than before.

Tap to pass external audio into the Nuraphone for conversations, awareness and calls.

Single and Double tap allowing up to 4 functions now including Volume control and other new features.

Spoken battery level & audible charging signal.

Seamlessly swap between paired devices.

Utilising built-in microphones.

Adjust Nuraphone functionality wherever you are, even in the air.

All the other amazing Nuraphone functionality features.
The Nuraphone
— Headphones Reinvented.