Communication by SENA, protection by SHOEI and Harman Kardon sound. The SRL-EXT was designed specifically for one of SHOEI's best-loved helmets, the NXR2. The compact SRL-EXT offers Mesh and Bluetooth intercom as well as smartphone connectivity for music, GPS, phone calls and much more. SRL-EXT users will enjoy high-quality Harman Kardon sound inside their NXR2 helmet. The SRL-EXT offers premium features such as: - SOUND BY Harman Kardon speakers and microphone - Designed specifically to fit the SHOEI NXR2 - Bluetooth 5 - Mesh Intercom™ ( Group mesh up to 24 riders / Open Mesh almost unlimited riders, 9 channels) - Bluetooth® intercom (4 riders) - Digital assistant access - Advanced Noise Control™ - 11 hour battery life