Hi Sir,Good day!Glad to know that you're on the market of Household Appliance.This is Paul from HK Walking Cloud,with 7 years exp,vendor of HP,MAZDA,FORD,etc.including Portable Air Purifier,Humidifier,Aroma Diffuser and Vacuum Cleaner.Any comments will be highly appreciated!Best regards,Paul HK Walking Cloud Tech Co.,LtdWeb:www.hkcloudy.comMail:paul@hkcloudy.comTel:+86 0755 29030677 Fax:+86 0755 83956979Skype:live:popcorn.xky