The photosensitive probe is on the same plane, with a small solar panel shade positioned above. When the light intensity on the left probe differs from the right side, the motor turns left until both probes achieve balanced values. The size of the shade affects the angular accuracy. It is recommended to cover both probes simultaneously. Tracking angle accuracy depends on probe placement position, angle, and shade size. Color: as shown Material: PCB + plastic Package Contents: 2 x Solar Tracking Module Only the above package content is included; other products are not included. Note: Lighting and different displays may cause slight variations in the color of the item in the picture compared to the actual product. Measurement error allowance is +/- 1-3 cm.