Wireless temperature and humidity sensor

Wireless and maintenance free temperature and humidity sensor (optical) with a small pre-installed solar cell, an internal energy harvester. If energy storage fully charged, it can work 4 days in total darkness.

When wake up, a radio telegram will be transmitted in case of a significant change of measured temperature or set point values or if the external occupancy button is pressed.

This module can be glued or screwed in place and is thus easy to attach to glass and plaster.