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Oregon Scientific THR138 Wireless Temperature Sensor - Newegg.com
Oregon Scientific THGR268; Wireless Temperature & Humidity Sensor, RF transmission Frequency : 433 MHz; Number of channels : 3; RF transmission Range : maximum 30 meters; Temperature sensing cycle : around 40 seconds (THGR268 TH-GR268 THGR-268 THG-R2
Amazon.com : Oregon Scientific Wireless Indoor/Outdoor Thermometer with Alarm Clock and Led Backlight Silver : Patio, Lawn & Garden