The Sena Technologies 10UPad Bluetooth Communication system was built and designed with the helmet in mind. The 10UPad is discreetly hidden inside your HJC IS Max II helmet without all that extra weight hanging off to the side. Connect up to 4 riders over a 1 mile distance all while being able to listen to your music or take a phone call.; Connect up to 4 riders 10hr Talk time Advanced Noise Control FM Radio Bluetooth 4.1 Voice prompts Discreet design 1 Mile range