Specification: Condition: Brand New Item Type: Head Loupe Material: Plastic, Optical Resin Lens Color: Black Lens Magnification: 10x 15x 20x 25x Battery: 6 x LR1130 Button Battery (Not Included) Lighting Source: 2 LED Lights Product Size: Unfolded: Approx. 210 x 140 x 58mm 8.3 x 5.5 x 2.3in Folded: Approx. 85 x 155 x 55mm 3.3 x 6.1 x 2.2in Applies to: Read newspapers, documents, maps Repair electronic parts, clocks and mobile phones Beauty DIY identification, miniature carving, etc. Package List: 1 x Magnifying Glass Frame (with 2 x 25x lens barrel) 2 x 10x Lens Barrel 2 x 15x Lens Barrel 2 x 20x Lens Barrel 1 x Headband 1 x Manual Note: 1. Do not put the magnifying glass in direct sunlight to avoid fire. 2. Do not use a magnifying glass to observe the sun, so as not to burn your eyes. 3. Do not use ethanol, gasoline and other chemical liquids to wipe the lens and housing. 4. Please allow slight error due to manual measurement. Thanks for your understanding.BARRELS CAN BE USED ALTERNATELY- If you use this magnifying glass for a long time, the two lens barrels can be used alternately to relieve visual fatigue and improve work efficiency. REPLACE THE BATTERY- It is very convenient to replace the battery. Press and hold the switch battery cover and rotate it counterclockwise about 30 degrees, the switch battery cover will automatically popup, then take out the 3 old LR1130 batteries and replace them with the 3 batteries of this model (not included) with the battery negative electrode facing up. DESIGN- The LED lamp head is designed separately from the battery compartment of the control switch, which can prevent the illumination point of the light source from being changed when the switch is operated, and there is no need to recalibrate the illumination point during repeated use. 4 LENS BARRELS- Install the left and right LED magnifying goggles on the glasses holder. Each goggles is equipped with 4 lens barrels with different magnifications. The lens with suitable magnification can be selected according to the size of the object to be observed. SWITCH OPERATION- The switch operation is very simple. Turn the battery cover 40 degrees clockwise from the small circle to the light symbols. At this time, the LED light source is turned on, counterclockwise reversed, and the light source is turned off.