Green - yellow - red - here the loudness becomes visible! ... If it gets so loud in the group that the educator cant longer hear her own words, this noise traffic light is a great help: it switches to yellow or red and optionally emits a signal tone. The acceptable noise level can be adjusted in 4 steps or the individual traffic lights can be controlled manually.On the table or on the wall, every child has the noise traffic light in view. On the table or on the wall, every child has the volume traffic light in view. Service life of the LED lights: Ø 100,000 operating hours. Incl. power supply unit for socket. Can also be operated with 6 x AA batteries (not included). Material: synthetic material, metal Measurements: 14.5 x 9.3 x 47.3 cm
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