"Everything Is Energy." Einstein

Connect a phone using Bluetooth to a 20-50 Watt Amplifier. Any amplifier will work. However Above 50 watts, you must take care to keep the volume lower. At high volumes you will feel vibration perhaps too strong.

Phone Setup: When ready to use,
Download the Z-App to your phone. Follow instructions for use. It is important you know how to navigate this app.
When connected by Bluetooth to your 50 Watt per channel mini amplifier,
Tap on the three lines on the upper left of the screen to view options.
The menu appears. Your phone is set up with the frequencies you will need for your particular needs in My Zapp.
Tap the “My Zapp” icon and you will find My Zapp frequencies at the top of the next screen. At the bottom of the screen find My Sequences and tap it. A screen will come up with all your saved sequences for cancers, dental, and arthritis. Tap the one you want to use.
It is advised to set your time for each frequency at 180 seconds metastatic cancer use. However 10-15 minutes is fine otherwise.
You may change that time by tapping “Settings” on the menu page and setting the time for each frequency in a sequence as preferred.
Remember that it will remain at that limit until you go into settings and change it again.
If you are end-stage cancer, every other day is recommended.
Otherwise, you may play the frequencies as often as you want to.
You may experience some nausea and or runny stools. Do not be alarmed. Your body is ridding itself of dead cells.
The tens pads with crystals attached (keep them a foot or more apart) will work up to about 10ft away. A single large white quartz crystal rock with attached transducer is shown below.
You may feel more comfortable gripping the hand-held glassed crystals, (if you have a pair), near or on the area of most concern.
Make sure volume controls are at maximum on the phone and at about 10:00 on amplifier. (or until you sense the vibration)

The piezo transducer converts the electric coming from your speaker outlets to vibration. Attach this transducer to the flat part of the rock with super glue spread evenly on the brass side.

A single large crystal rock is more than enough to produce a strong vibration when a piezo transducer is attached to it. The piezo doesn’t need both amplifier channels — one channel alone can fully drive it. The crystal doesn’t increase or decrease the electrical power; it simply shapes how the vibration feels. Larger crystals tend to feel smoother and more solid, while smaller ones feel sharper and more focused. In every case, the sensation comes from mechanical vibration, not electricity.

Key Points

Only one channel of the amplifier is needed.
The piezo converts the electrical signal into mechanical flexing.
The crystal rock becomes the vibration surface.
The size of the crystal changes the feel, not the strength.
The piezo reaches full vibration long before the amplifier reaches full power.

or

Copper tubes make a great alternative to crystal rocks because copper carries vibration extremely well. When a piezo transducer flexes, copper doesn’t absorb much of that motion — it passes it along its length, almost like a small tuning fork. That gives the vibration a sharper, more resonant feel compared to the tighter, more localized buzz you get from a crystal. The piezo still does all the work, and the copper simply acts as a very efficient vibration conductor. It’s the same mechanical vibration either way — just a different material shaping how it feels. Get these at Home depot