Features:Solid body material: Made of ABS plastic material, this magnifying loupe is sturdy and durable, not easy to break. The optical lens, anti and wear resistance, long service life. Adjustable Length: Adjustable length allows you to clearly see uneven jewelry and circuit boards. You can twist the upper part of the magnifying glass until clearly see the uneven surface. Easy to Replace Battery: Hold both ends of the magnifying glass with your hands, and twist it in this direction showed on the loup. It will open and you will see 3 built-in batteries. Just replace the three batteries.This loupe magnifier contains 3 AG7 button batteries. Please note the batteries can last for 8 hours. Specifications: Magnification: 30X60X Effective Diameter of Lens: 30mm size: 14.81 x 13.00 x 6.10 cm Material: ABS+Optical Lens colour: Black Package Contents: 1 set x jewelers loupe(2 Pcs) Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.