| 名称／型号 | JM21 |
| 硬件方案 | Main controller: Qualcomm Snapdragon 680; DAC: CS43198*2; Amp: SGM8262*2查看官网原文Hardware solution：Main controller: Qualcomm Snapdragon 680; DAC: CS43198*2; Amp: SGM8262*2 |
| 工作模式 | Android mode/Pure music mode/USB DAC mode/Bluetooth receiving mode查看官网原文Working mode：Android mode/Pure music mode/USB DAC mode/Bluetooth receiving mode |
| 颜色 | Sky blue, 黑色查看官网原文Color：Sky blue, Black |
| 重量 | 约 156g |
| 尺寸 | 约 120.7x68x13mm |
| 音量调节 | Physical button查看官网原文Volume control：Physical button |
| 显示屏 | 4.7-inch (750x1334) bezel-less display查看官网原文Display：4.7-inch (750x1334) bezel-less display |
| 存储空间／可用空间 | 32G ROM/22G ROM usable;64G ROM/52G ROM usable查看官网原文ROM/Usable storage：32G ROM/22G ROM usable;64G ROM/52G ROM usable |
| 声道平衡 | L20~R20 (0.5dB per level)查看官网原文Channel balance：L20~R20 (0.5dB per level) |
| 按键 | Power on/off*1; Volume button*2; Play/Pause*1; Previous track*1; Next track*1查看官网原文Buttons：Power on/off*1; Volume button*2; Play/Pause*1; Previous track*1; Next track*1 |
| USB 接口 | Type-C USB2.0*1 (Charging/Data transfer)查看官网原文USB：Type-C USB2.0*1 (Charging/Data transfer) |
| 耳机输出 | Standard 3.5mm port查看官网原文Headphone output：Standard 3.5mm port |
| 平衡耳机输出 | Standard 4.4mm port查看官网原文Balanced headphone output：Standard 4.4mm port |
| 同轴输出 | Standard 3.5mm port (shared PO)查看官网原文Coaxial output：Standard 3.5mm port (shared PO) |
| 线路输出 | Shared 3.5mm+4.4mm ports查看官网原文Line output：Shared 3.5mm+4.4mm ports |
| Wi-Fi 无线网络 | 2.4GHz/5GHz, Supports DLNA, AirPlay, WiFi song transfer, etc.查看官网原文WiFi：2.4GHz/5GHz, Supports DLNA, AirPlay, WiFi song transfer, etc. |
| 蓝牙发射 (5.0) | AAC/SBC/aptX/aptX HD/LDAC/LHDC查看官网原文Bluetooth transmission (5.0)：AAC/SBC/aptX/aptX HD/LDAC/LHDC |
| 蓝牙接收 (5.0) | SBC/AAC/LDAC |
| FiiO Link 功能 | Android supports WiFi and Bluetooth control, iOS supports Bluetooth control查看官网原文FIIO Link：Android supports WiFi and Bluetooth control, iOS supports Bluetooth control |
| 固件升级 | Supports upgrading through local storage+microSD card+OTA查看官网原文Firmware upgrade：Supports upgrading through local storage+microSD card+OTA |
| 操作方式 | Supports gesture, two-button and three-button operations查看官网原文Operation method：Supports gesture, two-button and three-button operations |
| 供电方式 | Supports 5V/≥2A查看官网原文Power supply：Supports 5V/≥2A |
| 充电时间 | （3G+32G）约 2h (5V2A charger) （4G+64G）约 2.5h (5V2A charger)查看官网原文Charging time：（3G+32G）About 2h (5V2A charger) （4G+64G）About 2.5h (5V2A charger) |
| 音量 | 49 |
| 增益 | High gain查看官网原文Gain：High gain |
| 显示状态 | OFF |
| 播放曲目和格式 | MP3 44kHz/16bit |
| 均衡器 | OFF |
| 负载 | 32Ω |
