The light mounts to the rear of the helmet via a velcro strap system and is compatible with almost every helmet type.

Specifications
Brightness: 40 lumen
Battery Type: Rechargeable li-poly battery
Solid mode run time: 3h30
Blinking mode run time: 8h30
Pulse mode run time: 14 hours
Battery charging time: 2h30
Battery charging port: Magnetic charging cable

Mfr Claimed Weight
21g