The INKBIRD IBS-TH3 Pocket-sized 2.4GHz WiFi Temperature Humidity Sensor Indoor Thermometer Hygrometer 2-in-1 Sensor with Temperature Alarms is an innovative must-have home device! Using 3 AAA Batteries (not included), the unit boasts precise temperature readings (±0.3℃/±0.5℉), complete with a wide range of measurement ( -20℃- 60℃(-4℉- 140℉)). Offering top-notch CE and FCC certifications, the device allows you to measure in celsius or farenheit. Plus, the sampling interval and recording interval can all be customised. And for added peace of mind, it comes with a 1-year warranty! Get the ideal home sensor today!