Youshiko YC9312 Wireless Temperature & Humidity Sensor for Weather Station
Compatible with Youshiko YC9331, YC9333, YC9436, YC9438, YC9440, YC9441, YC9442, YC9443, YC9444, YC9445, YC9460 and YC9416, YC9418 Digital Weather Station and Clocks and also many more look like weather stations.