TravelTim Vibrating Alarm Clock Strong, pulsating vibrations, Vibration or buzzer alarm (switchable) Both audible and vibrating alarms offer a duration of four minutes, Audible alarm features an escalating volume Bright strobe light is featured in the following alarm options: Audible alarm/bright strobe light/vibrating alarm Audible alarm/bright strobe light, 24-hour LED display with push-button illumination Protective cover for controls -- can also be used as a stand