* IPX7 waterproof: Works even after 30 minutes of immersion at a depth of 1 meter* 3 times brighter than EL135* OptiCube lens technology* Low battery indicator* Mode memory function* Two light modes (Constant / Flashing)* Replaceable bracket spacer* FlexTight bracket* Battery life: Constant - 30 hrs (50 lumens) (approx.) Flashing: 250 hrs (50 lumens)* Battery type: 2 x AA alkaline* Lightweight and simple with a durable aluminum body* Lens serves as a power and mode change button* Versatile rubber mounting strap* Rear light features an angled strap to compensate for seat post angle* Battery life: up to 100 h* Battery type: 2x CR2032