Note: K22 remote controller only compatible with HC50 HC50-RM. ^^ Simply follow the instructions and easy to install it, matching with HFK HC50 or HC50-RM to operate and set. It will be in a continuous standby state once matched and can be used directly once the main unit starts work. ^^ 3 buttons design can realize you to the blind operation and keep safe during the motorcycling. Answer calls with one tap, keep hands on handlebarsno screen tapping needed. Switch functions instantly and monitor real-time ride data. ^^ IP67 waterproof and dustproof construction, works in good condition no matter it is sunny, rainy, snowy or dusty.