I could not believe that such a simple tool could bring so much enthusiasm and give a new dimension to my classes. I discovered it on one conference and I decided to examine how it will  function in my classroom. Ever since then, my students constantly require to play with it. 

Basically the bell could  be used  for two purposes. Firstly, as a sign for the beginning and end of some task during lesson time. Secondly, as a very efficient tool for playing the  the famous show 5 second rule. Naturally, students prefer the second purpose, because it is dynamic and energetic quiz show. Participants have to answer question just in 5 seconds and when ready to ring the bell. Questions can cover any topic, depend on your lesson's aims and be adapted for different age groups. They can vary from simple as name 3 ѕthings starting on the letter b, and move to more complicated and complex quiz questions. Participant have to be fast, think critically and give the correct answer within the time limit. With younger learners the time limit could be extended. Young or older all love to ring the bell. 

Your 5 minutes left at the end of your grammar class will never be boring. Do not hesitate to buy a bell and integrate it into your classes. Believe me it will make wonders in class.