1. Display: Three channels and indoor temperature and humidity can be displayed at the same time, and level III indoor environment comfort can be displayed. 2. Detection range: Indoor temperature, test range 0 - 50 , outdoor temperature, test range - 50 - 70 ; Indoor and outdoor humidity, detection range: 20% - 99%. Indication of indoor and outdoor temperature and humidity change trend. 3. Recording function: Record indoor and outdoor temperature, maximum/minimum humidity. 4. Functions: Alarm function for exceeding the upper and lower limits of indoor temperature and humidity, temperature and humidity calibration function, time and date display. 5. Easy to use: It can be hung and stood, accurate and reliable. Style: Standing and Wall Hanging Display Type: DIGITAL Model Number: Thermometer Hygrometer Usage: Household : Thermometer Hygrometer Power supply mode: 3 X AAA battery or DC 5V power supply Colour:Black Material:plastic Package Contents: 1 x Digital Thermometer(No Battery) 3 x Sub Machines 1 x USB Cable 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.