Young Ho, this is a very valuable tool. Thanks for making it free.

I like to have very clear charts, so no distractions. How I can hide the text for no clutter my charts?

Thanks you very much.

functionality seems great, all you need to do is hit a number and a line appears that work 

can we change the sound alarm somehow?? the alarm is too weak if need to be awoken (and also repeat functionality might be good)

It is an excellent job you have here! Thank you very much for sharing such a useful tool.

I would only add two minor corrections, if you could keep them in mind for future versions:

1. The indicator fails to capture events from the numeric keypad, at first I found it hard to make the indicator work because normally as a user in front of a pc when using to type numbers I use the numeric keypad (to the right of the keyboard), I'm sure many other users also use it.
2. At the moment of creating the lines, you could create them at a prudent distance so that the proximity alert is not activated immediately.

I reiterate your excellent work, I consider it an extremely useful tool. Thank you very much for your contribution

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Es un excelente trabajo el que tienes aqui! Muchas gracias por compartir una herramienta tan útil.

Solo agregaría dos correcciones menores, si pudieras tenerlas en cuenta para futuras versiones:

1. El indicador no logra capturar eventos del teclado numérico, al principio me costo hacer que el indicador funcionara porque normalmente como usuario frente a un pc al usar digitar números utilizo el teclado numérico (a la derecha del teclado), estoy seguro que muchos otros usuarios también lo usan.
2. Al momento de crear las líneas, podrías crearlas a una distancia prudente para que la alerta por proximidad no se active inmediatamente.