NICREW Aquarium Air Pump, Nano Silent Mini Oxygen Pump with Check Valve, Ultra Quiet <33 dB Accessories for Nano Fish Tanks

This is a great little device. It sticks to the glass on the outside of the fish tank and blows air through a tube into the water brick. Works well and makes very little noise. The best one I have bought. Would recommend to anyone with a small tank. The only downside is the length of the power cable. It is short, so may need an extension lead if it has to go a long way to the power. It was a good price and I would buy again when this eventually stops working.

Completely silent air pump that about as small as you could need, its not the strongest Airflow but works in my 125l airstone, would love to see this pump in other models for larger tanks and higher Airflow too, the design an silence would make it a massive upgrade to my 5 tanks. I dont mind the noise or bubbles just not droning pumps which product solves! There is no adjustment or dials but it just a plug and play experience. Due to the calmer nature of this pump it make a nice stable stream of bubbles rather than the choas some pump cause! Would definitely buy again for my other smaller tanks though im not sure it would work for anything above 120l ish.

Very compact, incredibly quiet. Less than 30db. Im actually not sure how it produces air as it is seemingly sealed. Using a technology not seen in traditional air pumps. It is not very powerful as a consequence but for a small tank it is perfect. Comes with a few bits to get you started as well. It is not adjustable.

Really good! Very quiet and perfect for my 50L tank using the max version.

Excellent Air pump Very Quiet, plenty of air for one stone.

Its quiet and very easy to set up. The small size makes it easy to tuck away behind the tank. A good and constant stream of bubbles too.

Great Little Air Pump – Highly Recommended This is a great little air pump and I’m very impressed with it. It’s compact, easy to use, and does exactly what it’s supposed to do. One of the best features is how quiet it is — it runs very smoothly and is far more silent than I expected. Overall, it’s excellent value for money and I would definitely recommend it to anyone looking for a reliable, quiet air pump.

Perfectly quiet and very sleek design, great if you're fed up of listening to the standard air pumps rattling like I was. However, less than a year later, it seems to be lacking 'oomph' and the air output has significantly reduced. So much so, I'm now looking at replacing. It's a reasonably priced unit, but disappointing not to last a year.