This inverter is very quiet. We used it in our RV's bedroom for items that require 110 volts from the battery system. We accidentally left it on when we went to bed and we couldn't hear it at all. This would be a good choice for those who want a really quiet inverter. It's not a true sine wave inverter, but everything we've used with it worked, including the air pump, diffuser, computer, fan, etc. Most of our inverters have fans, which are very noisy if the noise level is high at night sinks…