Wherever I am people always comment on this one! It is a free download from Google Play store (click HERE for Google Play store to download) and similar apps are available for Iphone. I call this my “check yourself” bell. Every time it chimes I stop what I’m doing (if I don’t stop, I try to acknowledge it mentally) for a couple seconds, close my eyes, and take a deep breath. I’ve used this for years and it helps keep me connected to the present moment. The timer is adjustable and mutable so it can chime as often as you’d like.