Features:Easy to install and operate.Press the power on/off button， and the water will be pumped out automatically.Clean gravel， siphon the fish excreta and other dirt out effectively without requiring a water change.Also be used as a water siphon for water changes， or to empty your aquarium when you connect a hose to outlet.Battery powered， safe for you and your fish.With adjustable height， it is suitable for small and large aquariums.Specifications:Material: PlasticPower: 2 * size 2 battery / 2 * size 3 battery (not inclueded)Flow rate? 520 L/hMax water depth: 52cm / 20.47inMax item height: 82cm / 32.28inPackage size: 30 * 10.5 * 5cm / 11.81 * 4.13 * 1.96in (L * W * H)Package weight: 276g / 9.74ozNote: Ensure to reach the lowest water level when start working， after the power is on， the water level dose not have to reach the lowest water level.Package list:1 * Aquarium fish tank gravel cleaner1 * Hose1 * Filter1 * Long tube