Powerful but irregular awakening.

Powerful but irregular awakening.
Although quite powerful, especially on his quartet melody of drills and hammers synchronized, the alarm clock is very irregular, it sounds between 6:45 and 8am, which does not allow to consider regular use.
Unable to set the alarm clock, we asked the site manager to set the alarm clock a little later to allow a smooth awakening, which works vaguely for a month and goes out of sync very quickly. What's more, the alarm clock can not be cut at the weekend, always at the same hours 6h30 / 8h, for 8/12 months
Very expensive, it takes a lot of party walls to drill to be certain to be awake (the other walls are not noisy enough, it is absolutely necessary walls adjoining)
I do not recommend