ThruNite TH20 520 Lumen CREE XP-L LED Headlamp A high output headlamp with max output of 520 lumens (CREE XP-L V6 LED) in turbo mode powered by one Li-ion 14500 750mAh battery. The logarithmic scale brightness adjustment system allows any brightness from 1.6 lumens to 250 lumens. Furthermore, the TH20 features a built-in SOS signaling mode which is important when roaming out in the wild or confronting dangerous situations. Unlike other light-weight headlamps which are made with plastic, the TH20 is made with aircraft grade aluminum which gives it exceptional durability and excellent heat dissipation allowing it to maintain high output for extended periods of time. The advanced design gives the TH20 a light weight of 96g (battery excluded). The TH20 can also use an easy to get AA battery which makes it a great choice for daily reading, camping and a tool light when you want your hands free. Let ThruNite TH20 LED Headlamp helps you out when you just don&#039;t have enough hands.This brilliant, powerful portable LED headlamp features a light-weight with 96 Gram, water proof. It has 4 working modes: Turbo, High, Medium, Low &amp; Firefly. Compatible with AA &amp; 14500 battery. The soft rubber band provides you more comfortable feeling when wearing it directly on your head. Also you can wear it on many kind of hats, like baseball cap, construction hardhat or some motorcycle or cycling hamlets. LED: CREE Cree XP-L V6 Battery Applicable: 1 x AA or 1 x 14500 battery Working voltage : 0.9 - 4.2V Turbo (250 Lumen / 93 Min) by AA battery Turbo (520 Lumen / 37 Min) by14500 battery High (230 Lumen / 95 Min) Low (1.6 Lumen /21 h) Firefly (0.3 Lumen / 14 Day) Long: 70 mm; Diameter: 24.5 mm Weight: 76 gram (no battery ) Peak Beam Intensity: 1120 cd Beam Distance: 67m Impact Resistance: 2m Orange-peel reflector Premium Type III hart-anodized Waterproof to IPX-8 Standard (1.5m ; 30 Min) AA, NiMH or Lithium ion compatible. Lightweight, comfortable to wear. Firefly mode with 0.7 lumens. Memorize the last mode you turned off the light. Advanced CREE LED, higher performed and more efficient. There&#039;s a &#034;neutral white&#034; option that&#039;s tinted slightly yellow. The beam produce a good balance between range (for outdoor) and flood (for indoor). The &#034;infinity&#034; brightness user interface control from firefly to full brightness. An extra sturdy rubber mount included