After all the reviews I read I was expecting much more. The device itself is quite shoddily made - the first batteries that came with it wouldn't charge. To be fair to Currentbody, they replaced them without quibble, which is lucky as it's almost impossible to find them in the shops. The on/off switch on the back will only go into the 'on' or 'mute' mode - so I can't get it into the fully 'off' position. Now that it's up and running, I really can't anticipate it doing very much at all. There's very little sensation when using the device, so I'm doubtful that it's doing anything at all. An expensive mistake.