Youshiko YC9310 Wireless Temperature 3 - Channel Sensor for Weather Station
The CamRate Summary:

Thought it would be about half the size it actually is. This means it is a little more conspicuous than I would have liked attached to the shed in the garden.Works fine over the distance I have it placed at, about 30m only one brick wall in the way, not sure what the max range is.I would however suggest that you buy some rechargeable AA batteries with it otherwise I think its going to cost a lot in the long runNice neat remote temperature sensor senders. Pity they arent accurate when compared to a mercury thermometer.

Works OK but there is no visual display on the device, so you cant use it as a garden thermometer, you have to go inside the house to the base unit to see what the temperature is.

https://www.amazon.co.uk/Youshiko-YC9310-Wireless-Temperature-Channel/dp/B016X1F8M4?SubscriptionId=AKIAIS3I5A33GTV7S27Q&tag=wwwcamratecom-21&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B016X1F8M4 Additional or Replacement, Three channel Wireless Temperature Sensor, 433MHz
Transmits up to 50 meters or 160 feet from the main unit.
Compatible with Youshiko YC9340 & YC9370 Digital Weather Station.
Suitable for outdoor and indoor use, Wall mounting or Desk top / Table standing.
Requires 2 x AA battery not included, Dimensions: 65 x 35 x 100 mm L x W x H
