Using NiteRider's innovative D.I.Y. software, you can program the Pro 1500 LED to your needs. Want to extend the run time? No problem. Need maximum brightness for a set amount of time? Just program it in. The options are virtually limitless! This smart system is powered from 2.5 to 30 hours by a Li-Ion battery and puts out up to 1500 lumens. There are three modes plus flashing and they're all controlled by a switch on the light.