This small rear light has an output of seven lumens. With one touch of the lens, the light can be turned on or off. The LED has five different modes. These range from fast flashing to giving off continuous light. In flashing mode, the Femto has sixty burning hours and when the Femto burns continuously, thirty hours. The Femto comes with two CR2033 batteries included. Features the Clip-On system that allows you to clip the light to your backpack or saddlebag, for example. And comes with a rubber strap that allows you to attach the light to the back of your bike.

Weight: 31g

The diagram below shows how many lumens the lamp offers in a given mode and how long the LED can sustain this. One lumen is equivalent to the light of a candle.