Feature: 1. Advanced Frequency Technology: Utilizing variable frequency technology, this aquarium circulation pump allows for flexible water flow adjustments, effectively simulating ocean environments for your aquatic life. 2. Convenient Remote Control: Equipped with a built in external control device, you can easily adjust the pump's power remotely, eliminating the need for frequent manual adjustments and enhancing user convenience. 3. Versatile Size Compatibility: This wave maker pump is suitable for a wide range of aquarium sizes, catering to everything from small home tanks to expansive public aquariums, making it a versatile choice for all aquatic setups. 4. Deep Water Circulation: Achieving effective deep water circulation, this circulation wave pump assists in promoting health water plant growth and enhances fish respiration, nurturing a thriving aquatic ecosystem. 5. Quiet Operating: Designed for quiet operating, this fish tank circulation pump operates quietly, ensuring that it will not disturb your aquatic creatures, promoting a peaceful environment. Specification: Item Type: Variable Frequency Wave Maker Pump Material: ABS Size: Approx. 6 x 11 cm / 2.36 x 4.33 in Voltage: 12V Gears: 4 Gears Recommended Tank Size or Water Volume: 50-100cm / 19.7-39.4in; 250L . Package List: 1 x Variable Frequency Wave Making Pump 1 x Instruction Manual 1 x Black Circular Cover 1 x Accessory