Color Box List: 2 x air stones 2 x air tube (1.5m x 2) 2 x check valves 2 x suction cup 1 x connector 1 x air pump 1 x user manual Keep your fish tank oxygen-rich with this ultra quiet, energy-saving aquarium air pump. The adjustable knob allows precise airflow control, while the dual outlets can run multiple devices simultaneously. Designed with noise reduction technology, it operates at ?35dB, ensuring a peaceful environment. Perfect for freshwater, saltwater, and hydroponic use, this pump set includes air stones, tubing, and check valves for an easy setup. A reliable choice for aquarists of all levels. NOTE: Place the air pump higher than the water surface to avoid water back flow and potential damage to the pump if not use the check valves. Please keep the air pump away from water since it is not waterproof.