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Wireless Thermometer       HR640D

RF transmission frequency: 433.92 MHZ
RF transmission range: 100 feet (30 meters) line in sight
Temperature sending: Around 40 seconds
Temperature resolution : 0.1℃ (0.2℉)
Centigrade and Fahrenheit Conversion

Main Unit:
1)2-line LCD displays indoor temperature and outdoor temperature.
2)433MHz transmission range to 30 meters.
3)Max / Min. temperature trend indicator
4)Temperature high/low alarm
5)Temperature Measuring Range: -5 ℃  to 50 ℃ (23℉ to 122℉)
6)Suggest to use 2pcs AAA alkaline batteries.
7)℃ / ℉ display conversion
8)Dimension: 108 x 98 x 26mm

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