[Best Choice] The adjustable submersible provides oxygen and water movement, which can improve the efficiency of air transferred into the aquarium and help promote healthier fish and aquatic plant life. [420MA DC6V] DC6V voltage, rated current is about 420MA, pressure is 400mmHg. The adjustable submersible 's noise measured by 30CM is 60DB, which is quieter and does not disturb people. [Dome Shape] The adjustable submersible adopts unique dome shape, integrated sound-dampening chambers, rubber feet and suspended motor actually flattens sound wave frequencies for quiet, performance. [High-quality] The adjustable submersible is made of high-quality plastic, this product is sturdy and durable, with a service life of 30,000 times. The product is small in size, and can be carried away in a pocket. [Ideal for] The adjustable submersible has strong practicability and can act as a fish aeration pump. Ideal for indoor or outdoor use with any freshwater or marine aquariums.Package List: Air Pump x 1