Item description from the seller

With a 4000mAh large battery and max 1000 lumens, the CR1000 headlight is designed for road cyclists that ride fast at night over long distances. Featuring Raveman's new anti-glare optical lens, the CR1000 creates a T-shaped beam, illuminating the road with a flood light for close distance, and a spotlight to see down the road - all without impacting an oncoming driver's ability to see.

Anti-glare optical lens with T-shaped beam, providing  close range flood light and long disctance spotlight
Extending battery runtime by connecting to external power source (power bank or e-bike)
Wired remote button to change brightness levels without releasing the grip
Side visibility to increase your riding safety
Micro USB charging port, compatible with most phone chargers
4000mAh Li-Ion high capacity and high density battery for longer runtime
Intelligent memory circuite remebers the last used brightness level and mode when turned on again
Quick release design for easily slid in and out
Campatible with handelbars from 22.5 to 35mm diameter