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| Specification | Details |
| Model | FiiO BTR15 |
| Product Type | Portable Bluetooth Receiver & USB DAC/Headphone Amplifier |
| Display | 0.96-inch OLED Display (96x96 resolution) |
| DAC Chipset | Dual ESS Sabre ES9219MQ x2 |
| Bluetooth Chipset | Qualcomm QCC5125 (Dual-Core CPU+DSP) |
| Bluetooth Version | Bluetooth 5.1 |
| Bluetooth Codecs | LDAC, aptX HD, aptX Adaptive, aptX LL, aptX, AAC, SBC |
| USB Controller | XMOS XU316 |
| USB DAC Decoding |
PCM: Up to 384kHz / 32-bit DSD: Up to DSD256 (Native) MQA: Full Decoder |
| Mode Switch | 3-Position Toggle (PC / BT / PHONE) |
| Equalizer | Global Parametric EQ (PEQ via FiiO Control App) |
| Output Ports | 3.5mm Single-Ended, 4.4mm Balanced |
| Output Power (3.5mm SE) | L+R ≥ 125mW + 125mW (32Ω, THD+N < 1%) |
| Output Power (4.4mm BAL) | L+R ≥ 340mW + 340mW (32Ω, THD+N < 1%) |
| Signal-to-Noise Ratio (SNR) |
≥ 120dB (3.5mm SE, A-weighted) ≥ 122dB (4.4mm BAL, A-weighted) |
| THD+N | < 0.0008% (1kHz / 32Ω) |
| Output Impedance | < 1Ω (3.5mm SE), < 1.5Ω (4.4mm BAL) |
| Microphone | Built-in Omnidirectional Microphone for Calls |
| Battery Capacity | 550mAh High-Temperature Lithium-Polymer |
| Battery Life | Approx. 8 hours |
| Charging Time | ≤ 2 hours (USB Type-C) |
| Dimensions | Approx. 32.0 x 72.2 x 12.5 mm |
| Weight | Approx. 37.3g |
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