The Apple Watch Series 2 Aluminum 42mm supports 2 codecs (AAC, SBC). The Apple iPhone 4 supports 2 codecs (AAC, SBC).
| Codec | Apple Watch Series 2 Aluminum 42mm Details | Change |
Apple iPhone 4 Details | Change |
|---|---|---|
| aptX LL | No | No |
| aptX HD | No | No |
| LDAC | No | No |
| AAC | Yes | Yes |
| UHQ | No | No |
| aptX | No | No |
| SBC | Yes | Yes |
| Bluetooth Version | 4.0 | 2.1 |
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