Features: 1.SAFE MATERIAL: Aquarium internal filter is made of premium plastic material, environmentally friendly and safe, suitable for all types of water, no effect on water quality. 2.FISH WASTE ISOLATION BOX: Aquarium internal filter adopts fish waste isolation box design, isolate impurities and waste, effectively improve water quality, suitable for fish tanks and aquariums. 3.FILTER PROPELLER: Fish tank internal filter comes with filter propeller inside, anti seize, also has stronger wave making function. 4.SUPERIOR PERFORMANCE: Fish tank internal filter has strong suction, low noise, silent operation, providing a quiet and peaceful environment for fish and aquarium lovers. 5.SUGGESTIONS FOR USE: Aquarium internal filter needs to be connected to an air pump (not included) for use, not recommended for use in fish tanks with sand. Specification: Item Type: Aquarium Internal Filter_x000D_ Material: Plastic_x000D_ Size: Approx. 6.8x16.5cm / 2.7x6.5in_x000D_ Use: Fish Tank Filtration Decomposition Fish Toilet_x000D_ Applicable Fish Tank: Within Approx. 50cm/19.7in_x000D_ Matching Air Pump Suggestion: About 4W(not included) PackageList: 1 x_x000D_ _x000D_ AquariumInternalFilter Note 1. Use must be less than 3cm/1.2in below the water level, and use with an air pump (not included)._x000D_ 2. Please allow some error in manual measurement.