Description: Material: ABS plastic + electrical components Model: with screen/without screen Screen display data: temperature, humidity, Temperature range: -20 to 65 degrees Celsius Accuracy: temperature-+/- 0.5 degrees Celsius, humidity-+/- 5% Alarm: with screen-sound to remind users Without screen-the mobile application displays the red data number to remind the user of the history storage time: every 10 minutes Bluetooth: 5.0 Battery: 1*CR2450 battery (included) Battery life: about 100 days Supported phone system: suitable for iPhone 4s and higher Applicable to and roid4.3 and higher Working voltage: 2.4-3v Size: with screen: 4.95*4.95*1.8cm/ without screen: 3.5*1.2cm Specifications: With the help of Bluetooth 5.0 technology, the humidity tester can be easily connected with your smartphone, and the test data can be clearly displayed on the mobile APP within 100 meters in an open environment.   Using MEMS digital temperature and humidity sensor to bring you high-precision testing services, with 0.5 degrees Celsius and 0.5% sensitivity and 1 second/time refresh rate, reliable use.   The humidity tester has a compact size, only the same size as a coin, which is easy to carry and does not take up much storage space. The top carrying strap design (the screen type monitor does not have this design) makes it very convenient to hang it on the wall hook.   The humidity tester can continuously monitor and record the temperature and humidity data for 10 minutes, which is convenient for recording, practical and convenient.   With the help of button battery and low energy Bluetooth 5.0 technology, the tester can support continuous work for 100 days.   The humidity tester is widely used in refrigerators, baby rooms, balconies, cars, cigar boxes, pet beds, medicine boxes, etc. Package Included: 12/3*thermometer 1*User manual