This Sony WM F51 is also known as HIP Walkman. It was released in 1987. General Specs: Type: Audio player Media type: Tape (Cassette) Power: AA battery × 1 Power line (optional AC adapter AC-D1M) Build-in headphones Maximum output: Headphone output 4mw + 4mw Body dimensions: 91.5 × 108 × 31.5 mm (WxHxD) Weight: 220 g Radio: AM/FM/TV tuner Auto reverse Battery indicator Tape selector Fully functional and in excellent cosmetic condition. It is difficult to come by one that is working perfectly. Mostly are non-working and headphones broken. All my items on sale are personal collection and well taken care of. I will be putting up more vintage cassette players in the comings days.