Electrical appliances

They're very popular these days. This is because they're much smaller than the normal ones, so you can carry them around with you. You often see people using them on buses, trains and in other public places. But the noise they make can be a problem. When they ring, they often play tunes or parts of songs and this can be annoying in a restaurant or at the cinema. But the advantage is that you can make a call whenever you like, and in an emergency this could be very important and useful.