Count Down Timer Software -- repost

Number count down software application to run on Windows PC running dual monitors with external device to control the running of it. Number counting down in second intervals. The numbers to be large, bold, bright yellow on black background. Amount of seconds counting down to be easily adjusted/changed. At the countdown completion , it displays a large, bold, bright green, capital “GO” on a black background. The “GO” to be displayed for 3 seconds. If it is possible to adjust the “GO” display, that would be beneficial though not a requirement. A “HOLD” message, that will be displayed, when actioned by the external device. The “HOLD” to be large, bold, bright red, capital on a bright yellow background. After the “HOLD” is actioned, then released or “un-actioned”, the countdown display time shown is to revert back to the start of the preset amount of seconds that will countdown. Interface easily accessible/available to allow for adjustment of countdown seconds and “GO” display seconds. Easily integrate with an external device such as: Logitech WIRELESS PRESENTER R400 Targus Wireless Presenter Kensington Wireless Presenter