i went to k-mart and saw them for 19.99$ the box says the pad will last for uo to 4 hours. it lists the ingrediant on the box and i will probably do a search on it. i wonder what it does exactly and if breathing that stuff in is any good for you. i use permanone for ticks on my cloths from time to time but i dont like to. deet sprays dont look all that great either but i guess you gotta use something from time to time.