What's the difference between a bell and an alarm clock?

The difference between a bell and an alarm clock is as follows:

1, ringtone is a Chinese word, which traditionally refers to the ringtone of class, but now it is mostly used to refer to the ringtone of mobile phone, reminding people that there is a phone call when it comes in.

An alarm clock is a kind of clock with alarm device. It can not only indicate the time, but also send out sound signals or other signals according to people's predetermined time. The movement structure of alarm clock mainly includes mechanical and timely electronic.