Cygolite Turbo 740 Single High Beam Led System Stem Mount Li-Ion Battery with Smart Rapid Charger State-of-the-art Cree XML LED technology for 740 lumens LED output Lightweight jet engine inspired headlight (90g) Durable weather-tight aluminum alloy headlight 6 light modes: High  Low  Boost - Flashing  Walking  SOS with run times from 2 ~ 23 hours on a single charge Includes headlight, Slim Li-Ion battery, smart charger, handlebar