Clock on Clock off Technology

Hey guys.
Im about to take on a business which has a number of employees.

I am a little skeptical on what time they actually start and finish up.

So Im wondering what technology is out there nowadays from the days when I used to CLOCK ON and CLOCK off at the BUNDY CLOCK!!!.

And what systems are available and what are they worth?
What systems are you a part of?

Thanks Guys.

GrT