The Apple Watch Series 2 Aluminum 38mm and Sennheiser Momentum True Wireless have 2 common Bluetooth A2DP audio codecs (AAC, SBC). The Apple Watch Series 2 Aluminum 38mm supports 2 codecs (AAC, SBC). The Sennheiser Momentum True Wireless supports 4 codecs (aptX LL, AAC, aptX, SBC).
| Codec | Apple Watch Series 2 Aluminum 38mm Details | Change |
Sennheiser Momentum True Wireless Details | Change |
|---|---|---|
| aptX LL | No | Yes |
| aptX HD | No | No |
| LDAC | No | No |
| AAC | Yes | Yes |
| UHQ | No | No |
| aptX | No | Yes |
| SBC | Yes | Yes |
| Bluetooth Version | 4.0 | 5.0 |
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