Hi All,this is kevinleo scent,for scent machine, it works with essential oil,no any water, no fragrance oil. It can set up any work time 0:01-23:59 mon-sunday.5 work interval ( event 1,2,3,4,5) with density time(scent work/scent pause). if no work,please check if your local time is within work interval (event 1 on -event 1 off). please contact us if any problem.