1、Multi-Function: Wireless temperature and humidity detection, time, date, alarm clock, smart WIFI APP, remote real-time data monitoring, can take up to 5 sensors, APP to view one year historical data such as day, month, year, etc., APP to adjust the display brightness, Celsius & Fahrenheit switching,13 in 1 function. 2、Come with Multiple Wireless Sensors: Wireless indoor outdoor thermometer with remote sensors support to be connected to display readings from 3 or 5 different places simultaneously up to 60m apart. (Indoor wireless transmission distance 30m. Maximum wireless transmission distance is 60m in open and non-interference place, please keep away from metal objects.) 3、Wide Measuring Range: The temperature humidity gauge has a high-precision sensor, temperature measurement range is -4°F~131°F (-20°C~55°C), temperature measurement error is ±1°C; humidity measurement range is 1%~99%RH, humidity measurement error is ±3%RH. 4、Easy to Use: Just press ℉/℃ Switchable button, then you can choose Celsius or Fahrenheit temperature unit. The thermohygrometer is powered by 3.7V 18650 batteries (included) for 6-7 hours of continuous operation, and the sensor is powered by 2pcs 3V AAA batteries (not included). 5、Widely Application: Indoor/outdoor hygrometer wireless ensures proper temperature and humidity control, which has important health benefits, thermometer digital can be placed in baby room, nursery, cellar, basement, warehouse and greenhouse. Specifications: Quantity: 3 Pcs Sensors, 5 Pcs Sensors (Optional) Material: ABS Thermohygrometer Voltage: 3.7V Sensor Voltage: 3.0V Thermohygrometer Current: 280mA; Power: 1 W Sensor Current: 60μA; Power: 0.18 mW Thermohygrometer Battery: 3.7V, 18650 Li-ion, 2000mAh (Included) Charging Time: 2-3 hours Working Time: 6-7 hours Sensor Battery: 2 * 7 dry cell, 3V (Not Included) Temperature Measurement Range: -20~55°C Temperature Measurement Error: ±1℃ Humidity Measurement Range: 1%~ 99%RH Humidity Measurement Eerror: ±3%RH Charging Method and Interface: DC5V 1A/2A Type-C USB interface Thermohygrometer Size: 89 * 83 * 36mm / 3.50 * 3.26 * 1.41in Sensors Size: 59 * 59 * 19mm / 2.32 * 2.32 * 0.74in Thermohygrometer Weight: 165g / 5.82oz Sensors Weight: 40g / 1.41oz Package Weight: 396g / 13.96oz Package Size: 19.5 * 16 * 7.2cm / 7.67 * 6.29 * 2.83in Package List: 1 * Thermohygrometer 3 * Sensors 1 * USB Type-C Charging Cable 1 * Sensor Lanyard 1 * Sticker 1 * User Manual (English)