5PCS DIY KD9561 Voice Module 4 Kind of Alarm Sounds CK9561 Electronic KIT USA 5PCS DIY KIT KD9561 Voice Module 4 Kind of Alarm Sounds. Whistle alarm : K1=NC K2=NC. Fire alarm : K1=1 K2=NC. Ambulance voice : K1=0 K2=NC. Machine guns sound : K1=(any) K2=1. Smaller R = faster sound. byJuly 4, 2026
