Different Models
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Most of the articles are applicable for the entire Bose® Personalized Amplification System™ family of products. Where information is applicable to specific technologies there will be marker like the ones shown to the right.
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How to Tell
This is how to tell which unit you have.
| Marker | In Production |
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Distinguishing features |
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| L1 Classic | 2003 - 2007 |
 | Rounded front. Output panel has Amp1 Out, Amp2 Out, Amp3 Out |
| L1 Model I | 2007 - |
 | Rounded front, Output panel has Orange markings, L1 logo. |
| L1 Model II | 2007 - |
 | Extending legs |
