because it doesn't solve or find the problem very well. Some people use it for one day and feel very good, but then they use it for a while longer and have some problems with using it, such as: gas and bloating, allergies, etc.. Some more people are very uncomfortable using the device for 1-2 days, and then they are not going to buy the device, in fact, they use it for a few more days, and most of them are able to get used to it. So instead of offering a 1-2 day free trial, Hony Medical offers a 15 day rental, which can be waived if you end up purchasing Hony Medical's equipment.