When you connect to a power supply, you hear a beep and you can then use the touch buttons at the rear of the unit to set the amount of mist and the colours

The easiest way to fill it is by using the measuring jug which comes with the diffuser

my review, i hope this helps you to decide whether to buy the item or notwhen opening the humidifier i was pleased about the size of it and also the style, the size of the humidifier is just short of 4 inches wide, and is just over 2 and 1/2 inches in height and its very lightweight so no problem moving it from room to room , i got this to put in my conservatory as we chill out in here and thought it would be nice for setting the mood of the roomto use the humidifier you just simply take the lid off, fill with water to the top of the 8 water level marks in side, they are located 2 on each side, you have a jug supplied to do this, put the lid back on and plug it it in, there is a separate plug and usb lead providedit has 2 settings for the mist, you can have it on slow speed and fast speed, i personally like it on slow speed so it lasts a bit longerwhen on the slow speed it can last for up to 8 hours and on fast speed up to 4 hours, to turn the mist on you just press the mist button and it will come on, you use this button to change the speed and also to turn it off, you can put a few drops off your favorite scented oil in this toothe humidifier also has another button which is for the mood lights, you can set the colour you desire by pressing the button, you can choose from red, blue,purple,green

I am really happy with this item and can gladly recommend it

It has silicone feet to prevent it from easily sliding off a surface and is very stable

There’s a measuring jug to help you judge how much water you’ll need and a clear line on the unit to show the maximum fill level (100ml)