Alley F-800 Headlight features 800 lumens with side illumination ports to allow you to be seen when riding across traffic lanes, and handy features such as memory function which turns the light on at the last mode it was turned off. Features: 6 modes including Daytime/Night time Pulse for greater visibility High steady = 800 lumens for 1.5 hrs runtime; run at 400 lumens for 3 hrs runtime Fully USB rechargeable - no batteries to buy or replace Power saving function- 10% power or less, lights will automatically switch to lowest lumen output Memory function turns light on at the last mode it was turned off Specifications: Brightness: 800 Lumens Battery Type: Rechargeable (USB) Run Time: 1.5 - 24 Hours Beam Color: White Color: Black Weight: -