A new concept bicycle generator that generates a magnetic field and drives the generator without friction. (A hybrid concept bicycle generator that is non-contact drive but can be used as a contact drive)
A contactless generator that has the advantage of charging electricity generated while riding a bicycle directly with usb (the advantage of light and fast charging feedback due to lack of built-in batteries)
The contactless bicycle generator is extremely suitable for sustainable self-generation that uses healthy physical activities, and can replace a portable auxiliary battery.
That is because the contactless generator using a magnetic field has much lower Pedaling Resistance.
The contactless device magnetizes the rim surface only when the aluminum rim spins.
If a metal conductor moves in a rotary motion, the WHEELSWING can generate electricity anytime and anywhere.
Contactless generators work well on bicycles dedicated to rim brakes. 
It is recommended for cyclists on bike lanes or suburbs.
(Convert to a contact method when driving in the city.)

CAUTION: Do not touch the contactless generator if you have an artificial heart transplant. This may cause defibrillator malfunction.
Reference: Samsung Electronics, Hyundai Motor, Lotte Hi-Mart, Grand Walkerhill Hotel.