1. What's difference between μBTR and BTR1?
| uBTR | BTR1 | |
| NFC | Yes | N/A |
| aptX | Supported | Supported |
| Bluetooth codec | aptX，SBC, AAC | aptX，SBC, AAC（ver 2.0） |
| MIC | Yes | Yes |
| DAC chip | N/A | AK4376A |
| Bluetooth chip | CSR8645 | CSRA64215 |
| USB port | Type-C | Micro USB |
| Two device at once | Yes | Yes |
| Weight | About 13g | About 20.5g |
| Color | White | Black |
| Back clip | Yes | Yes |
| Sound effect | N/A | Yes |
| Notification tone | Yes | Yes |
Here is more details about uBTR: http://www.fiio.cn/%CE%BCbtr
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