You should specify a different tone for the last 3 "bips". We can't be looking the screen 100 percent of the time, so a different "bip" to indicate that the end

You should specify a different tone for the last 3 "bips". We can't be looking the screen 100 percent of the time, so a different "bip" to indicate that the end of the current countdown would be a good addition imo.