Thank you for viewing! This is a Sanwa Supply clip-on wide-angle lens for PCs, tablets, and smartphones. 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 find 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-install clip-on type. ・Comes with a storage case for convenient portability. 　*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 angle of view will be 106 degrees when the lens is attached. If the camera's field of view is 60 degrees, the angle of view will be 126 degrees when the lens is attached. If the camera's field of view is 70 degrees, the angle of view will be 146 degrees when the lens is attached. If the camera's field of view is 80 degrees, the angle of view will be 162 degrees when the lens is attached. If the camera's field of view is 81 degrees, the angle of view will be 170 degrees when the lens is attached.