It's quiet and works great. I'm able to sleep while it's on next to me. Easy to set up and it only took a few minutes. However, you will have to follow the manual carefully: 1. Download and register with the eWeLink app. 2. Paring the diffuser ith your phone using the app and your wireless router 2.4GHz network. You can now control the diffuser using the app. 3 Add this device to Alexa using the Skiil & Game menu. Now, you can even turn on and off via Alexa. I love the timer and schedule that turns the diffuser on and off multiple times through out a night.