What you are looking for is a "Bed shaker". These are often used by the deaf to wake up. A relatively cheap phone-connected one can be found here but it's iphone only. This one works with Android. Both use proprietary apps. The website linked was just at the top of a Google search, you can find stuff like this on Amazon as well.
What you are looking for is a "Bed shaker". These are often used by the deaf to wake up. A relatively cheap phone-connected one can be found here but it's iphone only. This one works with Android. Both use proprietary apps. The website linked was just at the top of a Google search, you can find stuff like this on Amazon as well.