ERS CO2 NB-IoT/LTE-M 5-in-1 Sensor: Temperature/Humidity/Light/Occupancy (PIR)/CO2 The ERS CO2 NB-IoT/LTE-M is a versatile wireless sensor for indoor climate monitoring that communicates via the NB-IoT and LTE-M cellular standards. It measures temperature, humidity, CO2 levels, light, and motion (PIR) and is suitable for discreet wall mounting in offices, public buildings, or residential settings. Thanks to battery operation with a runtime of up to 10 years, the sensor requires very little maintenance; the batteries can be easily replaced as needed. Network configuration is performed automatically via the SIM card or manually. All data transmissions are encrypted at the wireless level; settings such as sampling rate, data rate, or triggers can be conveniently configured via NFC and a smartphone.