my daughter be the world 's heaviest sleeper -lrb- age 7 -rrb- and this be the first alarm we find that not even she can sleep through . engage three sens to generate the wake-up : vestibular\/motion -lrb- via the vibrate pod you put under the pillow or mattress -rrb- ; sight -lrb- flash light -rrb- ; hearing -lrb- variable loud-mama blare alarm -rrb- . you can adjust the volume and the tone of the alarm , so if you have thinnish wall , you should still be able to use this . Great for special needs\/autism spectrum , adhd . Wish I would know about this before I waste gob of money try so many other alarm .