Comes with a Gotek floppy drive emulator and a thumb drive with 3 games to get you started. The Gotek comes with a cable and adapter to plug into the floppy drive port.  The Gotek is powered using the power supply which has a plug for that purpose

The power supply is a modern ATX power supply that has been modified to work with the  ST computer.

The STM model has an RF modulator so you can use it with a TV.  The screen shots show the video on a LCD monitor using a special made VGA cable.  This is much better that RF video.  Only monitors that work with 15 khz input will work with the Atart ST.   This is an early model ST that does not output 12V on pin 8 of the video port so it will not work with SCART to HDMI converters sold on Ebay.

I also sale a mouse for use with the ST.   If you buy any of these I will combine shipping and refund shipping cost.    The mouse has an adapter that allows a optical mouse to work on and ST.