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 products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 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. Features:Solid body material: Made of quality ABS plastic material, this magnifying loupe is sturdy and , not easy to break. The optical lens, anti‑fall 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 .