The final version. It has a revised "mesh" grill and a brighter display. This is the only model that natively supported the SoundTouch Wi-Fi adapter for streaming. 2. Buying Checklist for Used Units
Because these units are aging, check for these common issues:
Features physical buttons on top. Known for long-term durability but lacks modern features like MP3 CD playback.
This is the most common failure point. Test it with both standard and MP3 CDs if possible.
Older "green" displays can dim over time. The Series IV blue display is typically more reliable.
Check for "sticky" plastic (common on older models) or yellowing on white units. 3. Pricing Expectation
Removed top buttons for a sleeker look and introduced a front-loading "slot" for CDs. Added a "Bose Link" port for accessories.