New features such as button control & a new light head are just some of the important upgrades for 2019.Key Features:Light sensitive auto ON/OFF- To help you to conserve battery power when the light is not needed,Waterproof to IPX 4,Light Memory Mode – Stay on the same mode even when you turn the light off,Lumen and Run Time are tested under ANSI FL-1 Standard,Daylight Flash Mode – Making a cyclist more visible during the daytime ,Low battery, charging and fully charged indicator,.Lumen Output:Mode1 – 600lm (upgraded from 2018) – 2.00hr,Mode2 – 300lm (upgraded from 2018) – 3.30hr,Mode3 – 150lm – 6.15hr,FL1 – 100lm – 56.00hr,FL2 – 300lm – 18.00hr,Day FL – 700lm – 57.00hr,SOS – 32.00hr.