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
4380 Traceable Radio-Signal Remote Hum./Therm.
Oregon Scientific THC138 Wireless Temperature Sensor with Cabled Probe - Newegg.com
Oregon Scientific THR138 Wireless Temperature Sensor - Newegg.com
Oregon Scientific THGR 810 thermo/hygro sensor for WMR 100