You regularly see them on top of librarians' desktops and hotel lobbies. You often hear them ring once a certain degree of noise is within the library of if a hotel customer needs his/her baggage lifted to his/her room. What is it? It's a desktop call bell!
Oh yes, I never fail to hear this little bell ring once I am in the library. It just shows how students fail to keep quiet inside. Hehe. No wonder that in our library, a conference room was built to accommodate students who just cannot keep their mouth shut while inside the library. It was also created so that students who have genuine academic purposes can pursue a healthy discussion without bothering reading students.
I have never heard a bell ring inside a hotel, though, except in old cartoon movies. Hotels have, unsurprisingly, upgraded their system and computerized the summoning of bellboys--well, they are not bellboys now, are they?
Now, what use are these bells in the office? Surely, it is already a must to keep noise at a minimum while people are seriously working, right? But then again, the same silence is expected in the library, but many people fail to deliver. So I suppose bells can be also used in the office. No bells on the receptionist's table, though.
So think about it. Do your colleagues love to talk loudly to each other, without minding that they are in an office? If they are, then do not waste time now. Purchase a desktop call bell. Otherwise, if they understand where they really are, then there will be no need for that one.