Indoor Outdoor Digital Weather Station Monitor Thermometer Hygrometer Color Alert Alarm with 3 Wireless Transmitter Features: Upper and lower alarm: When the temperature and humidity exceed the set upper and lower line, the receiver will send out the corresponding color alarm 2 ways power supply: Can use 3xAAA batteries or for DC 5V power supply Can hang and stand Accurate and reliable Specifications: Wireless specifications: Transmission distance: open distance of 100 meters effective distance of 30 meters. Frequency: 433 MHz Indoor temperature range: 0-50 (Accuracy: 0-40 1, 40-50 1.5), resolution:0.1 Outdoor temperature range: -50-70 (Accuracy -10-40 1, 40-50 and -30 - 10 1.5, 50-70 and -50 - 30 2), resolution:0.1 Humidity: 20 percent -99 percent , resolution: 1 Main unit dimensions: Frame (L H for W): 12.5 x 12.5 x 2.5 for cm, LCD (L for W): 9.5 x 8 for cm Transmitter dimensions: Frame (L H for W): 10 x 3 x 1.2 for cm, LCD (L for W): 2 x 1.3 for cm Package included: (with box) 1 x Main Weather Station 3 x Wireless Transmitter 1 x Manual (English) 1 x USB Cable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.