1. Indoor and outdoor temperature and humidity measurement. 2. Open/close window reminder; 12/24 hours time/date/alarm. 3. Fahrenheit or Celsius convertible. 4. Large colour screen display, comfort level display. 5. Temperature trend display, maximum and minimum temperature and humidity records. 1. Measuring range: Indoor temperature display range: -9.9℃-+50℃ & 14℉-+122℉ Indoor humidity display range: 20%RH-95%RH Outdoor temperature display range: -40℃-+60℃ & -40℉-+140℉ Outdoor humidity display range: 20%RH-95%RH 2. Resolution: Temperature display resolution: 0.1℃ & 0.1℉. Humidity display resolution: 1%RH 3. Error: 0℃-40℃/32℉-104℉: ±1℃/1.8℉ -20-0℃/40℃-65℃/-4℉-32℉/104℉-149℉: ±2℃/3.6℉ 40%RH to 80%RH: ±5%RH 4. Main unit size: 150x95x22.5MM, Transmitter size: 50x105x26MM. 5. Power supply: main unit 3xAAA battery; transmitter 2xAAA battery(Battery not included) Due to different batches, there may be differences in product appearance and printed text, which not affect use. Colour:Black Material:Plastic Package Contents: 1 * Weather Station Mainframe 1 * Transmitter 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.