What is the TKaraokeUSB application, how does it work?

According to the introduction of T Software Solutions, LLC, TKaraokeUSB is a Entertainment app on the Android platform. There is currently a 1.0 version released on Nov 24, 2017, you can see the details below.

The ultimate karaoke player for your Android TV. Plays virtually any song format (mkv, mp4, vob, avi, m4v, mpg, etc..) and controllable from your phone or tablet.

The USB edition loads songs from your external USB hard drive. No song server running on a computer is required.

Features:
Support 4K songs (requires 4K-capable devices)
Support voice search (in English or Vietnamese)
Play virtually any song format
Specifically designed for karaoke users
Control via a mobile app connected to your wifi

Note that the free version limits to 1000 songs.

What's new in version 1.0 Improved startup delay when mounted with network drives over slow wifi connection.