The Sony WM-FX171 is a compact and lightweight personal stereo cassette player designed for on-the-go listening. It has a built-in microphone, allowing for voice recording as well as playback of pre-recorded cassettes. Some of its features include:1. FM radio tuner with 30 preset stations and automatic CBS tuning2. Auto Reverse playback for both sides of the cassette3. 3.5mm stereo jack for connecting external devices4. Adjustable bass and treble controls for customized sound5. Fast-forward and rewind functions for easy navigation through recordings6. Timer recording function, allowing for specific preset times for recordingOverall, the Sony WM-FX171 is a reliable and convenient option for those who prefer the convenience of cassette tape playback and recordings. Additionally, its lightweight and portable design make it easy to carry around and use while on the move.