The Sony Walkman WM-FX251 is a portable cassette player and radio unit in black/ silver/gray color. It has been serviced with a new drive belt installed and cleaned. This unit includes a headphone jack for audio output and a radio tuner for AM/FM bands. With a normal/crO2 metal tape selector switch, this Sony Walkman model offers a wired connectivity option and is part of the Walkman product line. This unit includes a leather case and non-OEM headphones. Please see photos for reference.  if you’re looking for cassettes to purchase for your Walkman, please check out my eBay store for a variety of cassette tapes. 
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