Notes1. When installing the fish tank water changer, please be sure to submerge the water changer in the water and exceed its starting water level line(MIN), and then turn on the starting switch.Otherwise, the product will not start properly. When the water exchanger outlet starts to flow, you can raise the water exchanger to work. (You can watch a video on this page.) 2. When using it, please pay attention to the water level of the fish tank must not exceed the highest water level of the water changer(MAX), otherwise, the electric machine will burn out. Material: ABS Plastic Input voltage: AC110- 220V Length:560-820mm(adjustable) Weight:285G Package Included: 1 x Aquarium Fish Tank Cleaner Pump Set (battery not included) -Easy installation aquarium vacuum cleaner + water siphon. -With this tool, you can remove the dirt from the bottom of your aquarium. -It can clean gravel,siphon the fish excreta and other dirt out effectively without changing the water. -Press the on/off button on the top, the water in aquarium will be pumped out automatically through a hose for changing water. -Remove the dirt from the bottom of your aquarium,be used as a water siphon for water changing,empty your aquarium when you connect a hose to outlet.