The NU20 is machined out of durable polycarbonate, with the back it rests and tilts on able to swivel up and down. It is hard-anodized for increased durability. This headlamp is also rated to IPX7 standard, meaning it can go underwater to 1 meter for half an hour but any deeper or longer risks damage.

Features:

• Manufacturer's page: Nitecore NU20 (CRI)
• Compact and lightweight headlamp designed for runners
• Advanced power regulation provides virtually limitless lighting
• Max output to 360 lumens and max runtime to 100 hours
• NU20 LED: CREE XP-G2 S3
  NU20 CRI LED: Nichia 219B, CRI ≥ 90
• Built-in 600mAh high performance Li-ion battery lasts at least 500 recharge cycles
• Micro-textured reflector provides 100° wide angle illumination
• 52° illumination angle adjustment
• Switch guard to prevent accidental activation
• Hollow-carved head supports compactness while reducing weight
• Housing is made of durable polycarbonate materials
• Impact resistant to 1.5 meters
• Waterproof according to IPX7

Specifications:

• Output modes: Normal (CRI)
  Turbo: 360 (270) lumens/30min*
  High: 220 (170) lumens/6hr
  Mid: 40 (30) lumens/7hr 45min
  Low: 1 lumen/100hr
• Max beam distance: 80m (69m)
• Max beam intensity: 1600cd (1200cd)
• Length: 55.5mm/2.19in.
• Weight: 47g/1.66oz

* = Runtime on Turbo based on calculations, not actual tests