Just by way of an update, I fitted the buzzer today and whilst it is a great idea and works as it should I cant hear it at all with my earplugs in so it is useless for me, however I am considering replacing the buzzer with an LED light or something bright that can be mounted in plainer sight than my indicator light as a reminder, finally the buzzer wire is woefully short and I mean like 3 inches long from the main control unit which is obviously an excercise in penny pinching and a bit crap really and even for someone who does not wear earplugs it is going to be a hard to hear unless you mount the unit and beeper somewhere exposed because the beeper wire is so short.