[Powered By Batteries]It is Powered by 2 x AAA batteries(Not Included),low power consumption, and the batteries could be replaced by yourself, very convenient [Eco-friendly Plastic Material]Made of high-quality plastic material, eco-friendly, sturdy and durable [Auto Fish Feeder for Travel]Our automatic feeder can help you feed your fish in aquarium tank when you are going out for work or traveling, practical to use [Easy to Install]Fix it with slot on the aquarium tank in a suitable place, and then rotate the screw knob tightly, or if you like,you can stick the feeder on the tank with included adhesive tape, but make sure the outlet of feeder box is installed in a correct position [Manual/ Auto]2 feeding modes available, you can choose manual or automatic mode to feed your pet fishes