It IS a car alarm remote, just with a different (pretty basic) circuit in it.
It does NOT tell you when to hit/stand/double/split/increase or decrease bet.
All it does is keep track of how many times you've pressed button A, how many times you've pressed button B, and then, when you press button C, it'll vibrate a number of bursts either short or long, that tell you how many more times you've hit A than B, or B than A. Thats it. ( I assume it has a reset button too.)
It doesn't do anything more than a card counter can.
Negatives of this device are that it still requires you to recognize all the card values and enter them into it, which may get picked up by the pit/security.
Also, you'd have to wait for it to emit it's vibrations before you could bet.
Why not just learn to count cards? All this device does is eliminate the need to keep count. You still have to do all the other parts. You still have to look at all cards and assign values before pushing the button. You still have to know Basic Strategy, you still have to divide for the true count, you still have to use a bet progression, you still have to learn count affected playing strategies.