Microphone Speaker Soft Cable Headset Accessory for Motorcycle Helmet Bluetooth Interphone Intercom Maximum talking range 1200 meters between 6 riders Wireless hands-free communication for motorcyclist and scooters Noise cancellation, Wind and noise compensating microphone with super-slim speaker Fit any motorcycle helmet, work with any 3.5mm-plug devices, such as MP3 player, cellphone, GPS Back side with self-adhesive tape sticker and nylon band, you can easily install the flat headphones into your motorcycle helmet