shock device

I work with a particular type of professionals who need to be trained in certain precise activities. We developed a methodology for these trainings but we need a device to boost the student response for the sounds they need to be alert to.

So I need one device that will be attached to the student arm, like a watch.

This device will have a SOUND sensor, and will react to 3 different frequencies or ranges.

Frequency #1) The device vibrates
Frequency #2) The device gives a electric shock pulses to call the student attention
Frequency #3) The device gives a stronger electric shock pulses

The device will keep vibrating and giving shock as long the sound is on.

The three frequency sounds should be human hearable (not yet defined, the engeneer is free to suggest them)... and it may be recorded in an MP3 file so it can be reproduced on a cell phone application.

You do not need to worry about the Phone APP... we take care of that here... We just need the device.

It needs to be small enough (like a watch - or little bigger than that)
it needs to be rechargeable via USB-C port.
it needs to have a charge led to indicate when it is charging... and when the battery is low.