The spec page says 100 kHz BW on the oscilloscope, the FAQ says 400 kHz. In either case calling it an "oscilloscope" is a stretch, its the ADC channels on an MCU.

I find it curious that all their promo shots seem to only show the back of the board. I couldnt find any of the component side, or any information about what components are used. My guess would be:

- a very small dual rail supply

- AVR or STM MCU

- Signal generator is PWM through an RC low pass filter

- Oscilloscope is potentially just the input through a resistor network to shift +/- 5V to 0-5V, maybe a buffer to keep input impedance high.

I just don't see $170-200 of value here, or anything close to that.