Sea - Saw is a beautiful plastic moving toy for your Aquarium.It is continuously moving toy on aquarium air machine.It's underwater action gives a great pleasure to children's as well as elders.It moves up & down.You can adjust it's speed of moving by just controlling the air pressure of your air machine.No need of battery.If you want to give connection of your air machine to another toy or air stick just joint the 'T' joint & you can get 2 ways.In that case there are chances of the air bubbles came only from one toy,don't bother just cut the pipe where you get max.air bubbles & fit controller to reduce the air flow.After tightening the controller you will get bubbles at another end.It's really a beautiful fish product for your aquarium decoration, it is great to decorate your aquarium all the time with minimum responsibility and maintenance.It also provides a excellent hiding place for fish, highly imitative, loved by aquarium enthusiasts. Add unique landscape for your aquarium.If you are a fish lover, and you keep a wonderful fish tank at home, it is really a fantastic decoration for your aquarium. Made of special first-level plastic, it is non-toxic, which will not do harm to your fish. Designed with air-operated character,As it looks real and attractive your fish will love it. Build an interesting aquatic garden that is both pleasing to the eyes and beneficial for your fish and help them live a happy life from this great decoration, It is vividly add lively and natural look to your fish tank.To operate this you required Air machine which is not included in this package.