Good streamer that does not need wi-fi or internet to play local files

I was confused. Wi-fi is a type of "internet" or "LAN (Local Area Network" too that is shared between mobile devices via hotspots and radio wave transmission. The difference in terms of communication standard is that Ethernet is IEEE 802.3 based and Wi-fi is IEEE 802.11 based. When there is power outage and ethernet is down, as long as your cell phone or other mobile device has active "hotspot", the LAN can still be kept functional and, consequently, the streamer will still be able to stream music via wireless LAN. Most of the music playing app is developed / coded upon ethernet / wi-fi.

Bluetooth (BT) is totally a different animal although it is also a wireless technolog. Wi-fi enables connection between the mobile devices and the internet / LAN, while BT connects and transfers data between two devices in shorter range via electromagnetic wave. Very few if any streamers actually develop app on BT.

Also, based on my limited knowledge, Aurender does not have a Wi-fi or BT components built in (see below) but you could add an optional wi-fi adapter to enables WLAN.  The Conductor app works on LAN in either hard-wired or wireless form but definitely not on BT.  You might be confused wifi with BT for the aforementioned reason.

OP,

It is simple and cheap to connect an Aurender in a house with WiFi. You just buy a wall wart wifi extender… $69. Plug it in near your streamer and run an Ethernet cable between the extender and streamer. I have a $150K system running this way (with an Aurender streamer) and a $15K headphone system (with a different Aurender streamer) and they sound fantastic. I know of lots of world class systems that work this way. Great streamers like Aurender work great this way.

Power over ethernet or ethernet over power?  Confused again but who cares as long as it works.  Thank you @ghdprentice.  I like awesome tech like this...

Avoid Ethernet over power… this communicated via the power lines. This is a dirty way. You want to use a wifi extender… though the air… for instance:

https://www.pcmag.com/lists/best-wifi-range-extenders?cq_src=google_ads&cq_cmp=10946242207&cq_con=138593969035&cq_term=wifi%20extenders&cq_med=&cq_plac=&cq_net=g&cq_pos=&cq_plt=gp&gclid=CjwKCAjwloynBhBbEiwAGY25dEGKd_r8dlqYBpTEEJyRcQ6-s2elI03iS9i7HtJKjSZ19T611CxiRRoCPh8QAvD_BwE