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 3*AAA 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 & -30 ~-10 1.5, 50~70 & -50 ~-30 2), resolution:0.1 Humidity: 20%~99%, resolution: 1 Main unit dimensions: Frame (L H for W): 12.5 * 12.5 * 2.5 for cm, LCD (L for W): 9.5 * 8 for cm Transmitter dimensions: Frame (L H for W): 10 * 3 * 1.2 for cm, LCD (L for W): 2 * 1.3 for cm Package included: (with box) 1 * Main Weather Station 3 * Wireless Transmitter 1 * Manual (English) 1 * 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.