3PCS DC 3-5V USB Micro Submersible Mini Water Pump,Small Aquarium Pump for Fish Tank Aquariums Pond Fountain Hydroponics Garden (Black)

Would give no stars if possible. Out of three pumps, 1 already seized and 1 is making alot of noise. I bought a second set for another project and already had to use 2. Pumps only been running for a few days. What makes it worse is the the disassembly to replace.

They dont make too much noise when fully submerged but if youre trying to use them above the water line they are quite loud. but still a great value for the money and plenty of flow

I ordered this unit to be able to pump some liquid to a container, however it has very low pumping power, that makes it not useful for my application.

While they work great from the start, when I disconnect for switching out battery packs they often won't work. Later after sitting they have worked again. Intermittent use and switching out the pumps only worked for a while. After several times they all just stopped working.

You get what you pay for. Bought these for a nano aquarium project. Unfortunately they are extremely loud compared to normal Fish Tank filters of all sizes. unfortunately I am outside of the window of return. Otherwise I would return them. The first one installed ran for about five hours after set up, then made some grinding noises so I switched it out. I’m on day two of the next one but I have replacements on order I could only see using these pumps again in the transport of fish for water circulation in an emergency.

Every now and then they get very loud. Great value for salt water.

The small size is ideal for a birdbath. For how long it holds up will be another question, since it's made in China.

I bought these to use on a daily basis and the first one only lasted to weeks. I’ll look for something more powerful. I don’t know how long they would last for occasional use.