The Cateye Combo Kit El135n/ld130 Bicycle Light is composed of a 3-LED headlight and a three-LED tail light or indicator. The headlight has a bright white output powered by three powerful yet energy-saving white LEDs, which do not consume much power from the battery. Its heavy duty AA batteries wont require frequent charging as they last for more than 80 hours on Constant mode and for approx. 320 hours on Flash mode. The headlight features the FlexTight technology that does not require any tool for installation and can be mounted on virtually any handlebar. The indicator on the back is equipped with three LEDs and will be an add safety to your rides. There are three flash modes that can be used accordingly. It is powered with two AAA batteries that provide 120 hours of run time. The FlexTight bracket and an included clothing clip will allow you to clip it anywhere onto your bike.