Feature: 1. This temperature data logger can read temperature data in real time through mobile phone NFC sensor. 2. Multiple recorders can be monitored at the same time through APP without worrying. 3. Over-temperature alarm setting and LED flashing warning can report abnormalities in time to avoid losses due to temperature changes. 4. 500,000 sets of data storage temperature collection interval can be set independently according to needs. 5. This temperature data logger is applicable to all aspects of the pharmaceutical cold chain, which can be used to detect, track and record the temperature of vaccine drugs. Specification: Item Type: NFC Temperature Data Logger Model: TTE35124 Temperature Measurement Range: -30℃~70℃ (-4℉~158℉) Temperature Measurement Accuracy: ±0.5℃/0.9℉ Start/Stop: Press and hold for 5s, the red and blue indicator lights will flash for 5s. Mark: Short press twice, the blue light flashes 25. Read Date: The recorder is close to the back of the phone, and the phone reads the data through NFC Battery: CR2032 button battery 300mAh (built-in battery shipped). Package List: 1 x NFC Temperature Data Logger