{"product_id":"f-audio-fa4","title":"F.Audio FA4 dual ES9038Q2M Balanced output mp3 Player","description":"\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e \u003cmeta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"\u003e\u003c\/p\u003e\n\u003cstyle\u003e\n        body {\n            font-family: Arial, sans-serif;\n            line-height: 1.6;\n            margin: 20px;\n        }\n        h1, h2, h3, h4 {\n            color: #333;\n        }\n        ul {\n            list-style-type: none;\n            padding: 0;\n        }\n        ul li {\n            margin: 5px 0;\n        }\n        .specs, .features, .package, .instructions, .operation, .bluetooth, .relay, .usbdac {\n            margin-top: 20px;\n        }\n        .container {\n            max-width: 800px;\n            margin: 0 auto;\n            padding: 20px;\n            border: 1px solid #ddd;\n            border-radius: 10px;\n            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);\n        }\n        .highlight {\n            font-weight: bold;\n            color: #0056b3;\n        }\n        a {\n            color: #0056b3;\n            text-decoration: none;\n        }\n        a:hover {\n            text-decoration: underline;\n        }\n    \u003c\/style\u003e\n\u003cdiv class=\"container\"\u003e\n\u003ch2\u003eFA4 High-Fidelity Portable Music Player\u003c\/h2\u003e\n\u003cp\u003eThe FA4 is a high-fidelity portable music player designed to provide an exceptional listening experience with its advanced hardware and optimized software system.\u003c\/p\u003e\n\u003ch2\u003eProduct Parameters\u003c\/h2\u003e\n\u003cdiv class=\"specs\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eModel:\u003c\/span\u003e FA4\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eProduct Weight:\u003c\/span\u003e 230g\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eHigh and Low Gain:\u003c\/span\u003e low 4DB\/high 6DB B\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eScreen Size:\u003c\/span\u003e 2.4 TFT\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eProduct Size:\u003c\/span\u003e 10.6 x 5.8 x 1.68 cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eBattery Capacity:\u003c\/span\u003e 4000mAh\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eCharging Time:\u003c\/span\u003e about 4.5H (recommended charger ≥2A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eBattery Life:\u003c\/span\u003e high gain about 14 hours \/ low gain about 16 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eBalanced Output Power:\u003c\/span\u003e low gain about 390mW\/high gain about 460mW\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"highlight\"\u003eSingle-ended Output Power:\u003c\/span\u003e low gain about 280mW\/high gain about 350mW\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2\u003ePrecautions for Use\u003c\/h2\u003e\n\u003cdiv class=\"features\"\u003e\n\u003cul\u003e\n\u003cli\u003eIf the memory card cannot be read directly, please format it on the computer.\u003c\/li\u003e\n\u003cli\u003eRecommended memory card: Samsung white card 130MB\/s, 64-256G. Capacity ≥ 64GB = exFAT, \u0026lt; 32GB = FAT32. Select 64KB for allocation unit.\u003c\/li\u003e\n\u003cli\u003eFor high-speed cards, set all memory speeds to ON in the system settings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2\u003eGeneral Operating Instructions\u003c\/h2\u003e\n\u003cdiv class=\"operation\"\u003e\n\u003cul\u003e\n\u003cli\u003eThe left and right sides of FA4 are the menu or music list page turning; the volume up and down is up and down.\u003c\/li\u003e\n\u003cli\u003eLong press the back button to return to the main menu + play preview (approximate information will be displayed when playing).\u003c\/li\u003e\n\u003cli\u003eLong press the OK button (middle button) to enter the black screen mode; if you need to change the song in the black screen mode, turn it on in the system settings.\u003c\/li\u003e\n\u003cli\u003eLong press the power button to reset.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2\u003eBluetooth Transmitter Operation Instructions\u003c\/h2\u003e\n\u003cdiv class=\"bluetooth\"\u003e\n\u003cul\u003e\n\u003cli\u003eEnsure the Bluetooth headset is set to pairing mode and disconnected from the previously connected mobile device.\u003c\/li\u003e\n\u003cli\u003eGo to System Settings--Bluetooth Transmission--Bluetooth Scan, find the headset, click the headset name, and the connection will be automatically completed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2\u003eBluetooth Receiving and Decoding Operation Instructions\u003c\/h2\u003e\n\u003cdiv class=\"bluetooth\"\u003e\n\u003cul\u003e\n\u003cli\u003eFA4 system settings - \"Bluetooth transmission - \"Bluetooth switch to Off.\u003c\/li\u003e\n\u003cli\u003eFA4 returns to the main interface, finds the Bluetooth decoding, and confirms.\u003c\/li\u003e\n\u003cli\u003eTurn on the Bluetooth search on the mobile phone, pair it after F.AUDIO (BT) appears, and connect it. When the Bluetooth of the mobile phone displays \"Connected audio for media\", it can be done.\u003c\/li\u003e\n\u003cli\u003eFind any music software on the mobile phone to start playing and you can listen to it from the lunch box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2\u003eRelay Operation\u003c\/h2\u003e\n\u003cdiv class=\"relay\"\u003e\n\u003cul\u003e\n\u003cli\u003eThe relay will work once under the following conditions:\u003c\/li\u003e\n\u003cli\u003ePower on\u003c\/li\u003e\n\u003cli\u003eShut down\u003c\/li\u003e\n\u003cli\u003eBluetooth code when receiving a signal\u003c\/li\u003e\n\u003cli\u003eSwitch between high and low gain\u003c\/li\u003e\n\u003cli\u003eWhen switching between DSD and PCM music\u003c\/li\u003e\n\u003cli\u003eWhen switching between different samples\u003c\/li\u003e\n\u003cli\u003eRestore factory settings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhen the hard decoding relay is working, there will be a \"click\" sound, which is normal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eUSB DAC Specifications\u003c\/h2\u003e\n\u003cdiv class=\"usbdac\"\u003e\n\u003cp\u003eSupport exclusive, support dop=up to DSD256, support native=unlimited, mainly depends on the app, currently Haibei only supports DSD512, so we can only support DSD512.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eFirmware and Manual Download\u003c\/h2\u003e\n\u003cp\u003eFirmware and electronic file manual, demo video link, XMOS third-party driver for PC: \u003ca href=\"https:\/\/pan.baidu.com\/s\/17afFdtXFjiGDkWxOH6g9rA\" target=\"_blank\"\u003eDownload Link\u003c\/a\u003e (extraction code: 6666)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S423c455978014ae89c9c46ff4c058722X.jpg?width=1080\u0026amp;height=1440\u0026amp;hash=2520\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S6f02a3af49a7448b8f3caf1b2ae509d92.jpg?width=1080\u0026amp;height=1080\u0026amp;hash=2160\"\u003e\u003cimg 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