The Quartz Crystal Generators can do the same as Metal Cylinders/Pads without the restriction being connected to your unit.
Broadcast Mode vs Direct Contact
Broadcast Mode–The Quartz Crystal Generators transmit frequencies farther and better than the Direct Contact Cylinders or Pads.
In reasonable proximity (Same Room) you will receive the same benefits as you would if you were holding Metal Cylinder/Pads. This allows you more time to use your Frequency Generator without the restriction of holding the Metal Cylinder/Pads .