The maintenace free sensor technology measures ambient light levels with higher accuracy than indivdual photocells on NAi devices. If brightness falls below a preset threshold, the navigational aids are switched on via the NAi network.
![](https://www.atonsys.com.ar/wp-content/uploads/2018/05/Brightness_Transmitter.png)
The maintenace free sensor technology measures ambient light levels with higher accuracy than indivdual photocells on NAi devices. If brightness falls below a preset threshold, the navigational aids are switched on via the NAi network.