Double lens technology provides high quality precise light distribution Auto light sensor measures ambient brightness and adjusts the light mode automatically Side lighting for increased visibility and safety Memory function remembers the last mode used Fully USB rechargeable New snap tight bracket Display shows the remaining battery run time - battery symbol in the display starts flashing when battery level is below 20% 60 LUX 7 Modes Run time on eco = 30 hrs Run time on high steady = 3 hrs