The device makes a very ordinary quality overall impression and is quite compact design (92 x 60 x 20 mm).
The 20x10mm mini display shows the selected channel and (contrary to the current Product Photo) temperature and humidity next to each other, and is from about 50cm distance quite easily recognizable (to check the data on the location of the sensor).
According to the website of Oregon ([...]), the sensor is compatible with, inter alia,
BAR208, BAR808, RMR500, RMR500ES, RMS300, RMS600, BAR908HG, BAR628, BAR629, BAR688.
Technical Details:
Temperature range: -20 ° C to 60 ° C (step 0.1 ° C)
Frequency coverage: 433 MHz, 30 meters (without obstacles)
Datenüberträgung: every 40 seconds Channel no. 1-3
Batteries: 2x AAA 1.5V (included), Alkaline recommended (no batteries)
For 20 euros go price / performance perfectly fine, buy recommendation!