Made of premium plastic, ceramic core and magnet, suitable for cold water fountain pumps in fish tank and aquarium. Waterproof, can be put into the water, good insulation performance, no leakage of electricity. Single suction type, half open impeller, . Features -Color: Black. -Material: Plastic, ceramic core, magnet. -Size: About 5.60X5.20X2.60cm/2.20X2.04X1.02in. - A multifunctional submersible pump is suitable for fish tank, fountain, computer water cooling system, rockery fish pond pump - The powerful submersible pump can transport a lot of water, making the fountain landscape more attractive. : Please make sure that the connector is tightly sealed. - Low noise motor, using a motor, it produces less noise and runs more smoothly. - Low noise design, gives you a quiet environment, and the small pump is energy-saving and low-energy consumption. - Rotate the knob to adjust the water flow. Easy to disassemble and clean. When the motor makes a loud noise, it is recommended to use a lubricant. Specification: Flow: 0.25 3/h. Number of : 4. Cavitation allowance: 1 . Structural principle: jet pump. Number of stages: . Voltage: 5 : 2.3W. Rated voltage: USBDC 5V. Rated : 416 MA. flow rate: 220L/H. Noise: less than 37 decibels. Working life: hours. Outer diameter: inlet/outlet: 8.5mm/0.33 inch. Inner diameter: inlet/outlet: 6mm/0.24in. Waterproof rating: P68. Package list: 1 x miniature water pump 1 x U-shaped accessory