After a quick look mostly of them are based on a circuit that charges a big, high voltage electrolityc cap, that discharge his energy in a coil, producing very high V/m values.
Basically, a portable flash unit with a coil instead the xenon bulb... high technology that overwhelms the Matrix Nabuccodonosor's EMP generator 
Some units are built differently: instead using a big capacitor energy discharged in a coil, they use PWM waves at various frequencies driven by a mosfet in to the coil, generating a strong RF field.
This devices are sold from $150 to $ 900.
Of course they prefer to sell them at a little price instead using directly on the slots an take all the money, becoming millionaires.I wonder
a single reason that explains why a high voltage field/RF field should put a slot in win mode or instruct a coin machine to release coins...
I mean: the "win" condition is well written in the code that the MCU executes. The same is for the coin release. Jamming the MCU or the even the entire board
brings to a random condition that definitely is not a win condition/release coins command.
Older slot machines which are specifically vulnerable to this kind of attack. Some slot machines might send pulses from coin/credit module
This is prehistory.
As I said, they prefer to sell their devices at a little price instead using directly on the slots an take all the money, becoming millionaires.
similar device to that one. Nothing special, they are using the high internal resistance of 9V batteries to limit the current. It's just coils wound around 2*9V batteries
On the last line, the instruction says "if it doesn't work, remove the 10k resistor". Wow, real science!
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