Chest sink to the bottom,divers from the "chains" attached to the chest suspended in water, along with oxygenation, divers in the water floating swing, like chest should strive to explore the way, is very nice and funny.Range of motion is different depending on the size oxygen gas. Vary depending upon the range of motion of the different oxygenated gas.Chest lid automatic take off and landing so vivid effect and oxygen tank to play the role.The air hose with decorations on the adjustment of the or pump connections. Put into the aquarium decorations and fixed position. Ajust the air pressure to make decorations to get your ideal motion effects.Use air pump connection (Not included).Material: Resin,PlasticChain length:10cm/3.9''(approx)Box size:5.5cm x 4cm x 5cm/2.15'' x 1.56'' x 1.95''(approx)Color: Black,OrangeNote:Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Quantity: 1 pc(Not included air pump connection )