... pieces/cartonIt is a new smart switch which use sound to control, it avoids the tedious manual operation on the ... using 2 wires. It is easy to operate.4, Some energy-saving lamp which has special functions can use 3 ... ,working voltage:175VAC~250VAC 50Hz2,power :incandescent lamp≤100W,energy saving lamp≤40W,3 way3,delay time:60S±20S4,trigger ... temperature:-20°C~50°C7,dimension:Φ70mm Sound sensor lamp base