Features: Two types power supply: Rechargeable built-in battery or 2 pcs 1.5V batteries. Long work time: Energy saving. According to the number of feedings set, it can be used for 3-6 months on a single charge or by 2 pcs 1.5V batteries. Large capacity: 200ml capacity feed bucket, suitable for a variety of fish feed such as granules, flakes and powders. Intelligent design: You can set up to 4 feedings a day, feeding 1-3 times each time. At the same time, you can also feed manually and experience the fun of feeding. Wide applications: Fits for for fish tanks with wall thickness less than 25mm/0.98 inches. The feeder can perfectly feed goldfish and turtles on weekends or holidays. Package Includes: 1 Piece Automatic Fish Feeder (AF 2019A/AF 2019B/AF 2019C/AF 2021B) Specifications: Material: Plastic Color: Black+Green Style: AF 2019A/AF 2019B/AF 2019C/AF 2021B Size (Approx.): AF 2019 A/B/C: 15x7.5x11cm/5.91x2.95x4.33in AF 2021B: 14x6x10cm/5.51x2.36x3.94in Weight (Approx.): 285g note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!