The cardo BK-1 is a Bluetooth communication and entertainment system developed by Cardo Systems for motorcycle and bicycle riders. Cardo Systems is the leading provider of such systems, with over 7 years of experience. The cardo BK-1 allows riders to communicate with each other from up to 500 meters away in clear, full-duplex intercom mode while riding without having to stop or slow down. It connects to mobile phones and other audio devices to enable communication and entertainment on the move.