BL24 cycling LED light use double high performance CREE XP-E2 LED generates max 400lm output. The lamp integrated one 1200mah Li-ion polymer battery to support at least 4 hours non-stop lighting. Areo-space aluminum material with hard anodized surface finish make the light much more durable. Easy switch operation, quick click to switch high, med, low strobe, SOS modes after turn on the light. IP65 waterproof assure you can ride at rainning condition.