@jeep52 

Hi, may I know how you measured the temperature? Is it Fahrenheit scale ℉? 

Besides, a cool and well-ventilated environment is ideal for TP-Link devices, please:

1.To prevent potential risks caused by heat, do not place network devices on paper, cloth, fabrics, plastics that are not heat-resistant, or any other surface that doesn’t provide space beneath your device for heat dissipation.

2. Put TP-Link devices in the open, do not cover them with any objects, avoid placing in a closed space, and don’t let it suffocate.

3. Avoid placing TP-Link devices on top of any running electronic devices.

Putting two electronic devices together would greatly increase the surrounding temperature, which is bad for TP-Link devices and the device beneath it.

4. Keep your TP-Link devices away from direct heat or excessive sunlight.

By the way, what is the room temperature? and if you unplug it to cool it down, how long it takes to be so hot after you plug it back in?

  @jeep52 

Hi，Like any other electronic devices, the TP-Link range extender radiates heat during operation, it is expected that your TP-Link extender gets warm or maybe a little hot after running for a while depending on the environment. And based on the picture, it was 120℉ at that moment which is about 49℃, it is normal, please don't worry.