The Apple Watch Series 2 38mm and Sennheiser HD1 Wireless have 1 common Bluetooth A2DP audio codec (SBC). The Apple Watch Series 2 38mm supports 2 codecs (AAC, SBC). The Sennheiser HD1 Wireless supports 2 codecs (aptX, SBC).
| Codec | Apple Watch Series 2 38mm Details | Change |
Sennheiser HD1 Wireless Details | Change |
|---|---|---|
| aptX LL | No | No |
| aptX HD | No | No |
| LDAC | No | No |
| AAC | Yes | No |
| UHQ | No | No |
| aptX | No | Yes |
| SBC | Yes | Yes |
| Bluetooth Version | 4.0 | 4.0 |
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