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LCD Digital 433MHz Wireless 8-Channel Indoor/Outdoor Thermo-hygrometer with Three Remote Sensors Thermometer Hygrometer Comfort Level Alarm Function - Walmart.com
Bresser Wireless Weather Station Thermo/Hygro Sensor 5 Channel 433 MHz Frequency for Temperature and Humidity Detection, White & TFA Dostmann Protective Cover for Transmitter Items, Easy to Assemble, White : Amazon.de: Garden