I have a re300 model wifi range extender. I bought it second hand and have been using the device for 2 days. The device gets hot while it is working but it is not hot enough to burn my hand. Although

I am using RE300 model wifi range extender. I bought the device second hand and I have been using it for 2 days. I have some questions. What is the hardware version and what does it do? How can I find