Features: Portable LED Headlight;Good light spot converging;Big power and high intensity;ENT specific product;Using rechargeable lithium battery,light weight,longevity and the more comfortable carry,it is suitable for all kinds of surgical operation;The brightness can be adjustable,suitable for all kinds of requirements.Easy to fix on all of our loupes.Headband with leather, strong and easy to clean.Surgical headlights for doctors in examination and operation process, providing local lighting. Applicable to lighting, man-machine relationship requires higher or frequent movement of the occasion.Lifetime of bulb 200000HLight source 5WLight intensity 65000lux (can adjust)Color Temperature 6000KCharge time 5HWork time 4H (biggest light intensity)Input Voltage AC100-240V/50-60HZBattery Re-chargable li-ion batteryLifetime of battery 500 charge/discharge cyclesAdjustable:Brightness,Spot SizeMagnification:2.5X/3.5XWorking distance :440-540MM/320-420MMDepth of View 100MMField of view:130MM/60MMLenses weight:80GLifetime of led:10000hSpot size 1-9(at 420mm of distance). Packing list:Headband with leather:1Light Source:1Battery case:1Loupe 2.5X/3.5X:1Screwdriver:1Cleaning cloth:1Adaptor:1Users Manual Book:1