A contact bicycle generator with the lowest pedal resistance that uses the rim and friction of the bicycle wheel to generate electricity.
Electricity generated while riding a bicycle can be charged via USB only while driving. (Advantages: light and cheap / good for use in the city)
The rubber part called booster rubs against the rim, so there is no need to worry about tire wear, and it is a bicycle generator that charges well even if you drive at low speed in the city and stop many times.
Contact bike generators are ideal for sustainable self-generation using healthy physical activity and can replace portable auxiliary batteries.

Contact Drive is an innovative bicycle generator that uses friction to lower pedal resistance. Friction with the rim reduces noise and vibration and minimizes bike damage. Using frictional force, stable charging is possible even at comfortable driving speeds. It is recommended for daily life such as city/commuting/school/shopping. (Advantages: Lightweight, inexpensive, and offers practical charging capabilities.)
References: Samsung Electronics, Hyundai Motor Company, Lotte Hi-Mart, Grand Walkerhill Hotel.