When it’s time, this little device simply takes off and flies with annoying noise like mosquito makes. Even if you hit the snooze button, it won’t help as it takes off again and you will get out of your bed any way.
The small size will add to morning torture and maybe you will be running round the room and frighten your neighbors with terrifying noise. And don’t forget to shut the windows!
If you are a heavy sleeper, there’s also a possibility that you won’t wake up, then it will run out of power and can fall on your head or, hopefully, on other part of unresisting body.