Sena 3S Plus Boom intercom . HD Bluetooth 4.1 intercom for jet and modular helmets. It allows to use the hands-free profile with a Bluetooth mobile phone, listen to stereo music and have conversations with another rider or between rider and passenger. It offers excellent sound quality and very simple operation through two easy and intuitive access buttons. The Sena Utility application allows you to configure your 3S Plus very easily.