I've been using the 3M Peltor X5 (-31db) for a few years now after reading a post about them in this forum. Wish I had adopted them years earlier. I have been promoting them as a "must have" to my tool-using friends ever since. Today I received an e-mail promotion from Fine Woodworking for 3M Worktunes, which according to the specs are just -24. How much "worse" is that than the X5? Is that adequate for the workplace? Can Worktunes be configured to buzz when the cell-phone rings?