With Us develops and provides portable green energy products to make people use safer and cleaner appliances. As first challene, With Us developed the contactless bicycle dynamo. This can function in various ways such as a charger, safety lighting (headlight, taillight), navigation and action cam etc. With Us is targeting the global contactless generator market and aiming to achieve the revenue of 100 million KRW by 2019. With Us believes that their products will provide the most efficient auxiliary power supply system for bicycles as well as electricity-based vehicles.