[Specially Designed]: Suitable for all smartphones under 7.2 inches. []: Smooth plastic material will not scratch your smartphone. Upgraded with metal wheels on both sides to operate quietly. The device can hold two phones on the holder plate with a rubber band, allowing you and your family to track steps simultaneously in a quiet manner. [Powerful Functions]: Helps increase step count in fitness apps such as WeWard, Pokemon GO (Adventure Sync), Walkr, and Google Fit. Can generate up to 7200 steps per hour, helping you hatch eggs faster without leaving home. [Note Precautions]: Due to variations in smartphone sensor settings and placements, if step counting does not occur, try placing the phone upside down on the device or contact customer support. Note: All measurements are manually taken; please allow 13 cm error. Color may vary slightly due to lighting and screen display differences. Actual product may differ slightly from image.