Tech Trio Super Bright LED 1800 Lumens Headlamp with Rechargeable Batteries and Car Charger and AC Charger and USB Cable Smart Switch: Button switch on the back of headlamp (Three different modes). Luminous Flux: Up to 800-1800 lm at different modes. Matched Battery: Two pieces of 18650 lithium ion batteries (Included). Light Source: CREE XM-L T6 LED, ultra-bright and long lifespan.