Xeccon Spiker1206 1200 Lumen Sensor Handlebar & Helmet Bike Light with Samsung Battery BSS Super bright 1200 Lumen, using 2nd generation Cree XM-L2 LED! Automatic Sensing mode senses surrounding light and adjust brightness accordingly. Fits 25.4mm - 40mm handlebar and helmet; helmet mount kit INCLUDED! Simple High/Low/Strobe mode, with strobe function to alert motorists. 5200mAh Samsung Li-ion battery provides enough power for fantastic 4 hours run time!!!