Walkman: A História Ilustrada (1979–2004) A timeline of Sony’s cassette Walkman models from 1979 to 2004 - EP.25 - 1991: SONY WALKMAN WM-SX77

 

Released in 1991, the WM-SX77 took a more traditional rugged approach. A 4 mm resin body and aluminum cassette lid protected it from drops and pressure. It used a wired remote instead of wireless controls and focused on durability over convenience.

Battery life reached roughly 33 hours with alkaline cells, and an anti-shock system reduced vibration during movement. Unlike the WM-WX88’s wireless, water-focused design, the SX77 prioritized endurance and physical resilience for sustained outdoor use.