Great little product, the first alarm of many loud types tried that actually wakes me up. Screen is a little difficult to see some of the features but I now use a small magnifying glass to set it.
Thus is ok as long as you have it right by your head and, preserably, under your body. Neither the alarm or vibration is that loud and putting under your pillow would notm work. it needs to be touching you to feel the vibration and strapped oto your head to hear it.