Finally, you select the appropriate level of noise for any given situation!
Traffic light is computerized with adjustable sound level meter which can be set from 40 dB to 120 dB. Green light stays lit until noise in room goes above set level, then a flashing yellow light comes on as a warning. When sound level reaches 20 decibels above set level, a red light and siren sound come on (siren sound is optional).
Unit is 16 " tall and can stand on its own or be mounted on the wall. AC powered.
I like this unit, and I want to be the world leading seller of it, so we have it at the lowest possible price.