Features: Widely used to increase oxygen for aquarium aeration and outdoor fishing. Double working mode with long runtime: Continuous working (at least 13 hours), Intermittent working (at least 17 hours) . Built-in battery recharges with USB cable from a power bank or computer, very convenient. It is silent and will not disturb your sleep, work or the inhabitants in the aquarium. Compact and mini design, lightweight to carry. Discounted at only: US$ 23.51 
