For deaf or hard of hearing people, or just individuals who are deep sleepers, alarm clocks with a loud buzzer or strong bed shaker is a way to make sure that the person wakes up in time for work or school. Keep on schedule at home and on the go with bedside clocks, travel clocks and watches that can vibrate and/or have sound. Some models may also have multiple functions, such as being able to connect a lamp for notification when the alarm goes off, or the telephone rings.