Modes include low flash high flash fast flash pulse flash 2 led rotational flash 2 low 1 high flash low steady and high steadybattery indicator red led lower than 25 blue led fully chargedwater resistant lightweight weighs only 22 gramsmulti fit quick release system allows easy tool free onoff seat post fits sizes 10 32mmclip on system provides a versatile mount solution for straps and packsfully usb rechargeable no batteries to buy or replace lumen output 19 lumens beam d