You can attach this small device to either a belt (which my husband does) or in a loose pocket of your trouser ( I put it in my linen trousers pocket and it still records data) as I don't wear a belt. Very easy to delete currant days data which I have done each eve so it is reset for the next day. You do not appear to be able to retain previous days info. It would have been helpful to have had some instructions on the packaging as to how to re-set the time etc, which wasn't correct, but we fumbled our way through it and my husband worked it out. All in all a good little device to monitor our steps per day and calories used, for the price.