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
Oregon Scientific STR918 433 MHz Cable Free Solar Transmitter Replacement Part | eBay