The EXPAND Long-Range Bluetooth Intercom & Stereo Headset from SENA is designed to give you a stable, secure fit in any situation. With the EXPAND, you can communicate from headset to headset, take hands-free phone calls, and listen to music from your smartphone. The headset is both water and sweat resistant and features Bluetooth 3.0 technology for four-way intercom over half a mile range. Advanced Noise Control ensures noisy outside environments won't interfere, and each audio source has its own volume level which can be set to your preference. Integrated voice prompts assist you with set-up and operation.