Thank you for viewing! (⁠ꈍ⁠ᴗ⁠ꈍ⁠) This is a pedometer my father used to wear every day. One notch represents 100 steps, and one full rotation is said to be 10,000 steps. It shows significant yellowing due to age, but it's analog and works normally. The screw on the back is for zero adjustment. It's the type that clips onto your belt loop. It's an item that has aged, but I hope you can make good use of it m(_ _)m ♦ Please be sure to read the profile before purchasing m(_ _;)m