The Karbonn A21 and Bose QuietComfort 35 (Series II) have 1 common Bluetooth A2DP audio codec (SBC). The Karbonn A21 supports 1 codec (SBC). The Bose QuietComfort 35 (Series II) supports 2 codecs (AAC, SBC).
| Codec | Karbonn A21 Details | Change |
Bose QuietComfort 35 (Series II) Details | Change |
|---|---|---|
| aptX LL | No | No |
| aptX HD | No | No |
| LDAC | No | No |
| AAC | No | Yes |
| UHQ | No | No |
| aptX | No | No |
| SBC | Yes | Yes |
| Bluetooth Version | 2.1 | 4.1 |
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