Most read Warning: Possible battery drainage
When the device was once joined to a network and by any chance the
network is no longer present or it is out of network - it will wake up
every 15 minutes to find the network it joined before. It never goes to
deep sleep but continues to find its network every 15 minutes. This
scenario can consume up to 50 times power more than normal
operation. To avoid this unwanted power consumption, you need to
manually switch off the sensors when network is off.