Sena's premium HD speakers are redesigned and optimized for both physical comfort and unmatched audio performance. Designed with a beveled taper, the HD speakers fit easily into helmet pockets and give riders a more comfortable experience. Sena's HD speakers offer a marked increase in volume, bass boost, and clarity The additional BLUETOOTH processor also allows for Audio Multitasking so you can have a conversation via Mesh 2.0 Intercom while simultaneously operating Bluetooth such as streaming music, taking or making phone calls, or listening to GPS navigation Connect with virtually limitless Mesh Network device users in Open Mesh, 24 other riders in Group Mesh, or even connect via the 3 additional Bluetooth intercom connections with the option to bridge Bluetooth users into the Mesh group Mesh Intercom Technology Bluetooth 4.1 HD Speakers Audio multi-tasking Intercom 8km/5milesVoice command Multi-channel communication Group Intercom Advance Noise control