Features: The built-in CSR BR chipset and MAXIM integrated headphone amplifier can provide a better talking and listening experience. Support remote operation of FM radio, stereo audio and video playback and telephone call, making riding safer and easier. Bike-to-bike intercom for rider and pillion or two seperate bikes up to 800-1000 meters. Water-resistant device, suitable for outdoor activities. Delicate, small and water-proof design makes B35 be a good companion on your riding journey. Support FM Radio function, you can listen to your favorite radio during the riding journey. Easy to install and operate.