1.   At noon the watch beeps to warn Dunable he has one hour left to eat lunch, before his second dose.

2.   When the charge starts to wane, the SecureStart beeps to warn the owner that it needs a recharge.

3.   A Spanish inventor trying to help blind people negotiate city streets has devised a cane that beeps to warn of obstacles like stairs and crosswalks.

4.   Motorists beep to warn pedestrians and fellow drivers that they are about to run a traffic light.