I used a Relief Band (brand name) without much success a couple of summers ago. Trip back from Block Island to Cape May got pretty lumpy. My wife still kids me about watching the flashing light on the watch as I "attended to soiling the topsides" every hour for a bout 13 hours. I have not given up on the device yet though. It is very important that it be placed exactly on the wrist, that a good conductivity is made (gel supplied) and that the setting is high enough to be effective. I may have started out with any one or more of these less than adequate and then after "the onset", fine tuning adjustments became the least of my interests!