Review on ATPWONZ Mini USB Pump 200L/H Submersible Water Pump for Aquarium Fish Fountain Garden House Water Hydroponic, DC 3.5-9V, 1-3W by Lisa Zulo

The pump is small and very quiet so I would give it 5 stars except: I bought it to circulate water in a child's water toy about 30cm tall. The pump says hmax 60 (1.5m) which I think would still give a decent flow at 30 inches. In fact, it has decent flow up to about 22 inches, and when it hits about 29 inches it's barely a trickle. . At about 30 inches it stops moving through the water. (I've tried a few power supplies with more than enough amperage, so that wasn't a problem.) If the seller's description had a more realistic Hmax value, I'd give it 5 stars, but it's not double.