This is a new product that came out by Off a short time ago. I just purchased one and my boss has had one now for about 3 weeks and she and her husband use it all the time. She walks the trails that go by her yard with her golden retriever Abbey. The trail goes thru heavily wooded areas that have lots and lots of mosquitoes. I was very very skeptical when I first heard of this product by the way. After multiple uses of it though she has praised this item up and down and her husband says it works great too. I also have used it around my yard area when I am out working in the yard or outside with my dog Chance. I have also used it on some hiking trails and so I have to report similar results. It works extremely well. I felt that unless something was applied to your skin it might not work well. Not so. This device circulates something new called metofluthrin around you with the help of a circulation fan that is built into this device. To my knowledge there is not deet in this and I cannot detect any odor from this device either. It circulates the air out thru the repellent disc which is replaceable. It comes also with two double A batteries to power the fan and even has an indicator to let you know when it is time to replace the repellent disc. They last about 12 hours but you also have an on/off switch as well built into this. My additional thoughts are as follows. As long as this device continues to work trouble free Off has really come up with a great product here. There is quite a bit to be said about a product that does not have to be applied to your skin! I had one heck of a time getting one because all the stores were sold out!!! These are an extremely popular item and I will also warn you that there is much price difference from store to store. A large store like home depot has them for $8.99 as well as Big Y supermarkets. You will also find some helpful coupons on the Off website which you can print out for the disc refills. I really like this product!!!