can be used in the warehouse, medicine store, cold chain portation,reagent for cold storage, food refrigeration and greenhouse cultivation, through the app can detect multiple recorder at the same time, can be exported to upload PDF format data files,small volume, easy to carry, high sensitivity, 500000 groups of data storage. Nfc Wireless Data Logger 180days Data Recorder 500,000 Groups For Medicine Food How to use: One-time use Data recording capacity:500,000 groups battery:3.0v coin cell battery (CR2450)(not included) Battery life: 180 days Communication method:NFC(mobile APP) Start mode: manual key/software timing Shutdown mode: full stop Protection class: IP67 Colour:As Shown Material:plastic style:A Temperature measurement range:-30℃ - +70℃(-22℉ - 158℉) Humidity range:0-99%RH (temperature and humidity version) Humidity accuracy:±3%RH (temperature and humidity version) Note: Installation guide not included, Please check as much as possible to make sure the item is what you need. Due to different batches, there may be differences in product appearance and printed text, which will not affect use Package Contents: 1 * Induction Temperature Logger Recorder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.