https://ottawaphotographer.com/9bjri07o2 
Snowtalk 2 makes it easy to keep in touch while on the mountains. Skiers and snowboarders can now speak to each other using Sena’s Bluetooth® communication technology.
The Snowtalk 2 Bluetooth headset is designed to be installed into most ear pads of snowboard or ski helmets, to communicate with up to a total of four Sena Bluetooth headsets without the need for any cell phone/data connections.