Sound and light control Optional: You can only use Sound control, sound and light control can also be used simultaneously, but the light control cannot be used alone.
The two-stage amplification sound, adjustable magnification 100-5000 times, (corresponding to about 10 to 90 decibels sound), adjustable sound intensity threshold.
The light intensity threshold 10-10000LX adjustable sensitivity (roughly equivalent to the full black to sunny midday brightness varies the shade);
Pull 3-60S adjustable delay time (non-precision delay, delay capacitor charging and discharging, with sound trigger a relationship).
Reverse polarity protection, power supply reverse does not work, will not burn module.