Thank you for viewing! This is a clip-on wide-angle lens for PCs, tablets, and smartphones from Sanwa Supply. It has a 40mm diameter and comes with a cleaning cloth and instruction manual. Model: CMS-LENS1BK - Lens Type: Wide-angle lens - Clip Type: Smartphone clip-on - Color: Black The lens cover has some slight yellowing. I used it attached to a laptop for surveillance camera purposes. I think it's a much better lens than the ones you can get at 100-yen shops. The following is an excerpt from the manufacturer's website: Specifications Size 　Lens: Diameter 40 x H21mm 　Clip: W55 x D22 x H24mm Weight 　Lens: Approx. 40g 　Clip: Approx. 10g Angle of View 　Up to 170 degrees 　*The angle of view after attaching the lens will vary significantly depending on the built-in camera's field of view. Accessories 　Lens, lens cover, clip, cleaning cloth, storage case, instruction manual Features ・By attaching the lens, you can expand the field of view of your laptop's built-in camera to a maximum of 170 degrees. ・Easy-to-attach clip-on type. ・Comes with a storage case for convenient carrying. 　*The angle of view after attaching the lens will vary significantly depending on the built-in camera's field of view. 　*It may not be possible to attach it to some laptops. ＜Approximate Angle of View (Theoretical Values)＞ If the camera's field of view is 50 degrees, the lens will provide 106 degrees. If the camera's field of view is 60 degrees, the lens will provide 126 degrees. If the camera's field of view is 70 degrees, the lens will provide 146 degrees. If the camera's field of view is 80 degrees, the lens will provide 162 degrees. If the camera's field of view is 81 degrees, the lens will provide 170 degrees.