| Model |
BTR15 |
BTR5 2021 |
BTR3K |
BTR7 |
| Volume adjustment |
60 levels of independent adjustment |
60 levels of independent adjustment |
32 levels of independent adjustment |
60 levels of independent adjustment |
| MQA |
Yes |
Yes |
N/A |
Yes |
| Bluetooth configurations |
A2DP (multiple devices), AVRCP, HFP, HSP |
A2DP (multiple devices), AVRCP, HFP, HSP |
A2DP (multiple devices), AVRCP, HFP, HSP |
A2DP (multiple devices), AVRCP, HFP, HSP |
| Bluetooth codec |
SBC, AAC, aptX, aptX Low Latency, aptX HD, aptX Adaptive, LDAC |
SBC, AAC, aptX, aptX Low Latency, aptX HD, LDAC |
SBC, AAC, aptX, aptX Low Latency, aptX HD, LDAC, LHDC |
SBC, AAC, aptX, aptX Low Latency, aptX HD, aptX Adaptive, LDAC |
| Bluetooth version |
5.1 |
5 |
5 |
5.1 |
| Bluetooth chip |
QCC5125 |
CSR8675 |
CSR8675 |
QCC5124 |
| Independent DAC |
ES9219MQ×2 |
ES9219C×2 |
AK4377A |
ES9219C×2 |
| Independent Amp |
THX AAA 28 x2 |
| USB DAC chip |
Xmos Xu316 |
Xmos Xuf208 |
CSR8675 built-in |
Xmos Xuf208 |
| USB DAC sampling rate |
384kHz/32bit
DSD 256 |
384kHz/32bit
DSD 256 |
48kHz/16bit |
384kHz/32bit
DSD 256 |
| Independent pairing button |
Yes |
Yes |
Yes |
Yes |
| Independent volume button |
Yes |
Yes |
Yes |
Yes |
| Transmission distance (barrier free) |
10m |
10m |
10m |
10m |
| Status indication&display |
0.96-inch monocolor OLED display shows settings menu, such as battery level, volume level, and Bluetooth codec. |
0.49-inch monocolor OLED display shows settings menu, such as battery level, volume level, and Bluetooth codec. |
RGB indicator light shows Bluetooth codec, charging state, working state (Blue for SBC, Cyan for AAC, Purple for aptX/aptX LL, Yellow for aptX HD, White for LDAC/DAC, Green for LHDC |
1.3-inch IPS color display shows battery level, volume level, and Bluetooth codec. |
| Phone decoding (USB dongle mode) |
Switch between BT/PC/Phone mode with one toggle |
Supported (auto-detect USB input, switch by one-button) |
Supported (needs to disable USB charging in the settings menu) |
Supported (auto-detect USB input, switch by one-button) |
| Driver-free mode (switch mode) |
Supported |
Supported |
Supported |
Supported |
| In-vehicle mode |
Supported |
Supported |
Supported |
Supported |
| App control |
Supported |
Supported |
Supported |
Supported |
| Wake up voice assistant |
Supported |
Supported |
Supported |
Supported |
| NFC |
/ |
Supported |
Supported |
/ |
| Hands free/Microphone |
Supported |
Supported |
Supported |
Supported |
| In-line control |
/ |
CTIA microphone and in-line controls |
CTIA microphone and in-line controls |
CTIA microphone and in-line controls |
| BAL headphone output power@16Ω |
270mW |
240mW |
78mW |
235mW |
| BAL headphone output power@32Ω |
340mW |
240mW |
40mW |
320mW |
| BAL headphone output power@300Ω |
50mW |
/ |
/ |
40mW |
| 3.5mm headphone output power@16Ω |
165mW |
90mW |
50mW |
160mW |
| 3.5mm headphone output power@32Ω |
125mW |
80mW |
25mW |
165mW |
| 3.5mm headphone output power@300Ω |
15mW |
/ |
/ |
18mW |
| Noise floor (uV) |
PO≤2uV (A-weighted)
BAL≤2.7uV (A-weighted) |
PO≤2uV (A-weighted)
BAL≤2.2uV (A-weighted) |
PO≤2.0uV (A-weighted)
BAL≤2.0uV (A-weighted) |
PO≤3uV (A-weighted)
BAL≤5.5uV (A-weighted) |
| SNR (A-weighted) |
122dB |
122dB |
122dB |
117dB |
| USB port |
Type-C |
Type-C |
Type-C |
Type-C |
| Battery capacity |
550mAh |
550mAh |
300mAh |
880mAh |
| Battery life (AAC codec) |
8h |
9h |
11h |
9h |
| Charging time |
1.5h |
1.5h |
1.5h |
1.5h |
| Dimensions |
72.2x32.0x12.5mm (excl back clip) |
72×32×11.1mm (excl back clip) |
58×25×10.4mm (excl back clip) |
83.6×39.6×14.2mm |
| Wearing |
Back clip+strap |
Back clip+strap |
Back clip+strap |
Leatherette case |
| Weight |
37.3g |
43.7g |
25g |
68g |
