NEO is a battery free Bike light which made by Reelight, the company was founded in 2003 to create battery free bike lights, now company is one of the leading ones on the market of magnetic bike lights,

Bike light NEO work with magnetic energy, uses 118 lumen, has back-up power and no friction 100% power.

I use some bike light with batteries and without, ones with the battery which i never liked because of you need to change the battery time to time. With the battery ones but they make an annoying noises, best thing about this bike light is, it has no battery and it use magnetic plates which help the device get its power and it does not need to touch the tire. NEO Bike light is still on its founding you can check their Kickstarter page and learn more about this device.