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It's interesting to hack one of your appliances or lighting projects into a whistle controlled intelligent one. The whistled allows you to do so by simply whistling two musical notes. To set it up、you just need to connect your 5.5/2.1mm DC connector on one end and your load on the other.。Specifications。ESD protected PCB、covered in transparent heat shrinkable tubing。Voltage must be between 4.5 and 18V at the input(barrel connector)。Reversed polarity protection。Max current of 5A。16 bits PWM output。SWD pads for programming。Listening range of 15m / 50feet。Cortex M4 microcontroller performing 80 FFTs / sec。Maximum voltage on the screw terminals is 25 Volts(don't forget the flyback diode!)