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Specification: Features for Binocular Loupes: ► Magnification:2.5X ► Working distance:420mm ► Depth of field:80mm ► Field of View:60mm ► Weight:52g ► Frames:Ni-alloy or Titanium Packing List: 1. Main glass:1 each 2. Protect cups: 2 each 3. Inclusive cleaning cloth:1 each 4. Screwdriver:1 each 5. Flexible Headband:1 each 6.Adjust Tool:1 each Features for Portable LED headlight: ► High intensity>15000¡ª30000Lux ► Continuous run-time:>5 hour ► The power of the LED bulb:1 W ► The lifetime of the bulb:10000 hour ► All loupes are optional ► Very small volume and weight ► Battery pack weight:100g ► Charge voltage:AC110V/240V/50-60Hz ► Using the rechargeable lithium battery, light weight, longevity and the more comfortable carry, it is suitable for all kinds of surgical operation . Packing List: 1. LED head light: 1 each 2. Adaptor: 1 each 3. Battery: 1 each How to Adjust The Focus? 1. Firstly to adjust to the PD(Pupil Distance). You could finish it by the round knob. 2. Secondly Adjust to the lens to avoid 2 shadows here.You can adjust the left and right lenses. If the lens is too loose ,you can tight the screws by using the standard change vertebrae. 3. Working distance is the distance from the eye to the object . 4. Here you can adjust it to the closest distance from the lens. It can also look farther. Notes: If you have any questions, please contact with me freely, we are pleasure to serve you, thank you.