Terrano XT: The world’s top performing three-way bike-to-bike communication system for cycling Terrano XT drives bicycle Bluetooth communication technology to its limits. With super-long range, immersive sound, extra-tough shell and incredibly flat design, nothing comes close to Terrano XT abilities on the real road Compatible with most all bicycle helmets: Terrano XT is also the most fully featured Bluetooth communicator Terrano has developed to date Four-way intercom, Music, Radio, Audio sharing, Two-channels Phone/GPS pairing, Noise Filtering, Auto Volume adjustment, Advanced control App, VOX, and so much more – there’s practically nothing left out. If you’re on the lookout for outstanding cycling communicator device performance, in a quality, streamlined water-proof package – look no further