Propeller design, it is compact and creative. The powerhead pump has a strong suction cup base, so you can fix it stably onto the smooth tank wall. High quality plastic and metal material, this product is sturdy and can be used for a long time. There are four sizes available, which are 4*7*7cm (A), 4.8*8*7cm (B), 7.5*11.5*7cm (C), 10*15.8*7cm (D). The frequency of A is 50Hz, the power is 2.5W, flow is 2000L/H, wire length is 1.5m and it is recommended to use the fish tank below 60cm. The frequency of B is 50Hz, the power is 6W, flow is 3000L/H, wire length is 2.5m, and it is recommended to use 60-80cm aquarium. The frequency of C is 50Hz, the power is 6W, flow is 5000L/H, Item Name: Aquarium Wave Maker Pump Material: Plastic, Metal Applicable Fish Tank Size: Less Than 60cm (A), Frequency: 50Hz Maximum Flow: 2000L/H (A), 3000L/H Power Cord Length: 1.5m (A), 2.5m (B, C Output Power: 2.5W (A), 6W (B, C), Supply Voltage: 220V Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Aquarium Wave Maker Pump