What kind of hardware do I need to install?

[Weladee]

You need a starter kit.

If you want to use mobile application only, you will just need 2 iBeacons. These are small plastic devices including a battery. They can be hidden. Mobile application will let employees check in/out only when they are close (within 2 meters) to these 2 devices.

In most case you will want a gate station, this is a small computer device using very low power consumption that will allow mobile phone with bluetooth and RFID functionalities.