Front and rearlight. This model does not need batteries.
SL100 blinks/flashes while you are riding. The amount of flashes depends on how fast you are riding. With normal speed on 20 km/h the light flashes 200 times a minute. The light does not contain any batteries, so it works through a magnetic induction; when two magnets moves past each other, they are creating light.
The light is very environment friendly, like a dynamo light, just without any resistance.
With one magnet at the frontwheel and one at the rearwheel.
Does not fit bikes with rollerbrake or discbrake.