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

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

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.

These are great little pumps, especially for the price! With the ubiquity of USB-A charging ports, this is a straightforward addition to my setup. The only reason I'm not giving five stars is that they are a little loud unless used fully submerged. Granted, they are labeled as Submersible for this very reason, but it's just something to be aware of.

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.

Works well, but they're really really loud, or rather their hum is unbearable

These may be small but they pump a lot of water, and i run them using my solar panel ($20).

This product is below the bottom line for the Chinese garbage that Amazon sells. The pumps work for a while then start making noise then just stop. DO NOT BUY THESE.

After a week three out of six not longer work. One quit after 24 hours, others lasted a little longer. And it is not the water intake that might clog, the motor does not even try to start. The first one filled the motor chamber with water. Surprisingly recovered. I sealed it and it work one more night.