HR643D Wireless In/Outdoor Thermometer with Dual Alarm Clock

RF transmission frequency: 433.92 MHZ RF transmission range: 100 feet (30 meters) line-of sight Temperature resolution : 0.1℃ (0.2℉) Storage temperature : -30 to 70℃ Humidity measuring range: 20% to 95%RH Centigrade and Fahrenheit Conversion Main Unit: 1. 4-line LCD display in-outdoor temperature，clock and humidity separately. 2. 433MHz transmission range to 30 meters. 3. Proposed operating range : 5 to 50℃ 4. Humidity measuring range: 20% to 95%RH 5. Memory maximum and minimum temperature and humidity readings 6. High/low temperature and humidity alarm 7. Use 2pcs UM-4 or “AAA” 1.5V battery 8. ℃ / ℉ display conversion 9. Dimension: 140 x 110 x 50mm Remote Temperature Sensor: 1. Display temperature range :-20.0 to +70.0℃ 2. Proposed operating temperature range : -20.0 to +60.0℃ 3. Relative humidity : Up to 100%, condensing 4. LED indicator for transmitting a reading 5. Slide switch for channel selection. 6. Use 2pcs UM-4 or “AAA” 1.5V battery 7. Dimension : 92×60×20 mm