SOUND-ACTIVATED SWITCH (ALTERNATE ACTION)
Categories : Series 4 AC Controller By Light,Sound,Remote ,  Light & Sound Control , 
Product description
Using the FK409, students can demonstrate a bistable sound operated switch that responds to a voice or hand clap by changing state. Upon detecting the second sound the FK409 changes back to its original state. An on-board potentiometer allows for sensitivity adjustments.
Technical Specification