TLR Transmitters - Specifications - Environmental
Temperature:

Operating

-22 degrees to 150 degrees F (-25 degrees to 50 degrees C)

Storage

-40 degrees to 150 degrees F (-40 degrees to 50 degrees C)

Humidity:

Operating 0-95% relative humidity non-condensing
Storage 0-95% relative humidity non-condensing

General:

Transmitter is sealed in epoxy, however the wires will allow moisture ingress under some conditions. The module should be protected from in-climate weather.