the button, the feed bin stretch out and start discharging food. At the same time, the red light be on, and it automatically return the feed bin to the feed whouse when it reaches the maximum distance. When the red light is off, automatic feeding is completed. When the feed bin is out, the button again to pause the operation. When the feed bin is out, if need to withdraw feeding, double click the button to return the feed bin to the food warehouse. Colour:As Shown Material:Plastic Package Contents: 1 * Smart Fish Feeder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.