The Arcturus offers fantastic output from a small & lightweight chassis. Combined with an integrated light sensor makes the Arcturus ideal for the daily commute.1 pce 30 chip rectangualr COB LEDCNC aluminium heat sink Integrated light sensor (auto on / off) Auto sfe mode Mode memory function Rechargeable lithium polymer battery 3.7v 300m Ah 7 modeslow battery, charging & fully charged indicator Auto fully charged cut off Side visibility Water resistant IPX4 Daytime flash mode 70 lumens / 16 hours