Sonic switch is produced in four modifications (for the darkened and semi-darkened corridors etc).
Switch ABC-1 is designed for the darkened places, automatically switching the lighting when voice sounds or other noises caused by people coming are appeared.
Switch ABC-2 is designed for the semi- darkened places. It has optical sensor for blocking of switching the lighting. When the lighting is below 5 lux and any noise is appeared, the switch is activated.
Switch ABC-3 is designed for the semi- darkened places. It is activated by ineffective the operation of sonic sensor (the continual noise caused by the transports, noisy music etc). Switch ABC-3 has a button with highlight bar allowing turning the lights forcedly, irrespective of the noise level.
Switch ABC-4 is designed for the darkened places needing the continual tell-tale lights.
In this case, the half of voltage is applying to the lamp and it uses the half-glow. When switch is activated the lamp uses full-glow.