https://www.amazon.com/fire-tv-stick-4k-max-with-alexa-voice-remote/dp/B08MQZXN1X
I have several 4K max firesticks. Have never had a problem with wifi signal and do not ever expect one. Above specs are fine for streaming and I never have buffering. It most certainly is not underpowered as above specs confirm. For the money you pay and a guarantee from Amazon of several years support it is most certainly a good streaming device.