It's a compact USB thermometer that doesn't need a battery, but just connect to your phone and you can use it.   Features: Contactless measuring to avoid the risk of virus and bacteria transmission, safe and healthy.  Quick and easy to use, measures the temperature in 1 second, sensitive sensors, the data is accurate. With an LCD screen, you can read clearly.  ℃/℉ can be converted with one click, and the thermometer can be used for different reading habits.  Instead of a traditional thermometer, this USB thermometer is thinner, the size of a car key, and easier to carry.  Made of fine quality materials, practical and has a long service life.   Specifications: Material: ABS;  Color: Black;  Unit conversion: ℃/℉;  Measurement time: 1 second;  Measuring ranges: 32℃～42℃;  Measuring accuracy ±0.2℃;  Measuring distance: 1-8cm;  Operating temperature: 10℃～40℃;  Operating humidity: ≤85%;  Power supply: USB Input DC5V;  Automatic power-off: 10 seconds;  Product size: 43*35*14mm;  Product weight: 13g;   Note: *There could be some deviations due to manual measurement or slight color difference owing to photographing condition. Thank you for your understanding.   Package information: Package weight: 22g;  Package size: 11*7*1.6cm;   Package list:  1*USB Smart Thermometer;  1*Type-C Joint