The bell of our company deoesn't ring.

Recently, our company changed commute time, what's more, they also changed not to ring a bell when it comes to a break time. So there are few people who notice that free period comes. In case of me, averagely, I realize it after passing five minutes. Basically, I think they should ring a bell, or we don't notice it. Of course, the in the opposit of ending free period, we aren't able to know the starting time due to the bell. Especially, if I'm in my laboratory, I can hardly know time when it starts recess time. As a result, I loose my break time. It's a big problem, I alwasy studying English during free peirod. In the end, I want to exclaim "We shoudn't work during free periode.