For using this app properly You have to own this S4h Pro device!

The S4H-TMC-00 temperature sensor is fitted with two external probe (2m long cable). The sensor can be used as a simple temperature probe or as a thermostat with two adjustable temperature limits. Information about temperature is sent from the sensor to the cloud via Wi-Fi and the home AP at 5-min interval. In the thermostat mode, notifications are sent outside of the selected time intervals when the temperature falls below or exceeds the preset limit. Information on the cloud is sent to your smartphone, where you can display it using the S4h Pro application as a numeric value or in the graph. The measuring range of the internal probe is from -50°C to +100°C (58°F ÷ +212°F).