Hi Darren,

After reporting the data, normally the light on the sensor will turn off shortly. However, the light will stay on if all the following 3 conditions are met: 
1. You have selected automatic for light mode in the Netro app
2. The sensor battery level is high (larger than 90%)
3. The sensor is in dark or almost dark

Thanks,

Netro Support

Hi Darren,

It is possible the battery is complete out and they need to be recharged. The sunlight in the winter is very week but that should improve in spring. Do you have an incandescent lamp, if so you can use it to charge the sensors for 3 days and they should be back to live.

Thanks,

Netro Support