I have a diffuser from Bulk Apothecary that is waaaay better than this and it's 6 years old! This useless thing billows up an inch from the top and  then it drops down so the oil fragrance stays right where the diffuser is. It should diffuse straight up in the air, but it doesn't so immediately around the diffuser smells nice. Look somewhere else for a diffuser. This one is useless unless you want to sit right next to it to enjoy your stash or organic essential oils :/