Need a light with a powerful output that simultaneously highlights the edge of the trail, without compromising the far-reaching beam, AND automatically adjusting output in tune with the terrain? Then look no further than the Maxx D; perfect for aggressive riding on singletrack and technical terrain, thanks to its combination of lenses and Reflex Technology.Reflex+ Technology - Reflex automatically adjusts the light to provide boosted output when riding hard and fast then intuitively dimming for the slower sections such as climbs. This is all to optimise battery capacity, to provide extra light when needed and save it when not required.Reflex achieves this by using data from 3D digital accelerometers including gyroscope and thermistors. It continually analyses the data to make seamless adjustments to benefit the rider, probably better than the rider can. In reality it is a form of artificial intelligence. The selected run time will be achieved by averaging the output over the period.Key Features: Weight: 310g, Lumens: Max 2500 (Reflex 4000), Runtime: 2 - 36 hours, LED Configuration: 4 x White XPL2, Battery: 11,600 mAh Lithium Ion, Rechargeable: Through Case USB, Charge Time: 6 hours, Material: Anodised 6063 Aluminium, Water Resistance: IP6, Length: 115mm, Head Diameter: 54mm, MaXx-D MK13, QR Handlebar Bracket (31.8mm - 35.0mm), Fast Charger, QS Guide.