Three ways to connect:

Sena’s Mesh Intercom™ technology allows automatic connection to a virtually limitless number of 30K users: a ‘private mode’ allows users to invite and communicate with up to 16 riders at a range of up to 2km (1.2 miles); there’s also the option to allow an endless number of ‘guests’ to listen in. It also means more stable connections – if a rider goes out of range, the rest of the group stays connected while the 30K automatically searches for and reconnects to the ‘lost’ rider once back in range. In addition, the 30K is Bluetooth 4.1 enabled and can connect to up to three other Sena and non-Sena Bluetooth devices, at the same time as Mesh Intercom™ devices.
The Sena RideConnected App allows users to communicate with a virtually limitless amount of riders worldwide, over an infinite range, providing they’re connected to a mobile network.
Multitask:
Audio Multitasking™ technology allows users to hold a conversation, while simultaneously streaming smartphone music or listening to the built-in FM radio, taking phone calls, or hearing GPS navigation. The 30K also takes away the frustration and distraction of different functions ‘cutting in’, because the audio features won’t interrupt one another, but simply ‘overlay’ for a smoother listening experience. Hands-free and stress-free:
The 30K can be operated completely hands-free using voice commands, so the rider can move through music, phone, and intercom features without taking his or her hands off the bars or their concentration away from the road. A quick charge feature means that, in just 20 minutes, users get 5 hours of Bluetooth intercom use, or 3 hours Mesh Intercom™ use. The 30K is water-resistant and compatible with Sena’s optional Handlebar Remote control, as well as all the 20S clamp accessories. The Utility App (for iPhone and Android) means owners can configure device settings and access a quick user guide with ease

In the box:
•30K Headset Main Unit
•Universal Helmet Clamp
•Wired Boom Microphone
•Wired Microphone
•Hook and Loop Fastener for Boom Microphone
•Hook and Loop Fastener for Wired Microphone
•Microphone Sponges
•Glued Surface Mounting Adapter
•Foam Speaker Covers
•Speaker Pads
•Hook and Loop Fastener for Speaker
•Boom Microphone Holder
•Hook and Loop Fastener for Holder
•2.5 to 3.5 mm Audio Cable
•Rubber Pads
•Allen Wrench
•Speaker Port Cover
•USB Power & Data Cable (Micro USB Type)
•Cigarette Charger