Mega Raizin car fuel saver and booster.

I think this might be a clone product of another fake device. Hard to say, but it's got a most intriguing bit of fakery inside it.

The idea is that you connect this to the battery terminals of your vehicle and it immediately boosts the performance by filtering out electrical noise and smoothing the electrical power.
It does have one useful feature - a digital meter that wakes on electrical voltage disturbance and displays the current battery voltage and the lowest voltage while the engine was being started.

The capacitor bank turned out to be very unique.

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