and #9658 Upgraded Self-cleaning Function and #9668 Designed with self-clean function, there is no more clogging. When it is blocked and does not produce mist, just start the auto-clean mode, it will work normally. and #9658 LED Indicator Light and #9668 Blue light is on shows it is in normal working status. Red light shows insufficient power, orange light shows it is running out of medicine solution. and #9658 Waterless Detection Technology and #9668 It will auto-shut off when there is no water in the cup, there is no need to worry about destroying the machine. and #9658 Super Quiet and #9668 The noise is less than 25dB during working, it will not wake your kids when they are sleeping sound. and #9658 Battery/USB Cable Powered and #9668 It is not rechargeable. It needs 2 AA batteries or connects usb cable to socket to make it work. And please don%92t use the battery and USB cable at the same time.