RETRO BOX Desktop Bluetooth SpeakerCompatible with FIIO JM21/M21/M33 playersBluetooth/USB DAC modesHigh-resolution LDAC Bluetooth2+2 acoustic design5 W + 5 W full-range power10.5 hours of extremely long battery lifeHi-Fi/Retro sound presetsBuilt-in microphoneThe perfect companion for FIIO players – Enhance your soundThis speaker is specifically tailored to the FIIO JM21, M21, and M33 series. Once connected via Bluetooth, your player instantly transforms into a retro-style speaker reminiscent of a cassette recorder. It’s not only an excellent companion for music players but also an upgrade to your daily listening experience.Dual-Core Acoustic Design – Every Seat Is the Best SeatWith two dedicated speakers and two passive radiators housed in separate chambers, your sound remains clear and free of crosstalk. Thanks to this design, the speaker fills every corner of your room with rich and immersive sound—making every spot a “sweet spot.”*The speakers are offset to the side to make room for the player. This side-firing design creates a more even and balanced sound field that distributes the music more effectively throughout the room.Tireless performance, lasting impressionTwo 18500 batteries are connected in parallel to minimize internal resistance and supply the two-channel amplifier with ample power. The result is a robust continuous output of 5 W + 5 W, allowing the two 40-mm drivers to reach their full potential—experience a rich and powerful sound with impressive dynamic range.Dual-Mode Connectivity, Hi-Fi AnywhereBluetooth Mode: Features Bluetooth 6.0 and LDAC support. Experience refined, near-lossless sound quality even over a wireless connection.USB DAC mode*: Connect the speaker directly to your desktop or laptop PC to transform it into a high-end audio station—complete with high-quality speakers that deliver an immersive, wired listening experience.*The USB port is used for both data transfer and power supply. The speaker automatically charges or draws power as soon as it is connected. FiiO recommends avoiding connection to smartphones or tablets to prevent rapid battery drain.*UAC 1.0 support is available without drivers for sampling rates of 44.1 kHz, 48 kHz, and 96 kHz.Tailor your sound preferences—for every playlistA built-in high-performance DSP chip lets you choose from HiFi, Retro, Pop, and Warm presets to suit any genre.Simply press the volume control down to switch between profiles and find the sound that perfectly matches your taste.Thoughtful design that fits your lifeIntuitive controlsTurn the 360° dial for smooth volume control or press it to switch between EQ modes. The tactile buttons are clearly arranged so you can control your music by touch alone.Seamless phone callsWith the built-in silicone microphone on top, you can easily pause tracks, answer calls, or activate your voice assistant.Portable designThanks to the built-in mounting loops, you can attach a carrying strap for convenient transport—making it a great music companion wherever you go.*Shoulder strap and screws sold separately.Built for StabilityA reinforced housing and vibration-damping feet ensure the speaker remains absolutely stable even when playing highly dynamic music. FiiO’s “PUSH” pop-out design makes swapping out or removing your player a breeze.Smarter app control, continuous developmentWith the FIIO Control app, you can personalize your sound with custom EQ settings and switch Bluetooth codecs in an instant, while seamless firmware updates ensure your device always performs at its best. Keep an eye out for regular app updates to access new features.Package ContentsRETRO-BOX*1USB data cable*1M21 and JM21 mounting insert*1Quick Start Guide*1Warranty card*1User manual*1Technical SpecificationsDimensions: approx. 152.8 x 98.8 x 76 mm (excluding feet and controls)Weight: approx. 683 gColor: White/BlackOperating modes: Bluetooth reception mode/USB DAC modeBluetooth reception: V6.0, supports SBC/LDACPower supply: DC 5 V ≥ 2 ACharging time: approx. 2.5 hBattery life: approx. 10.5 h (Data from FIIO Labs in SBC format. Actual performance may vary depending on the music source and usage conditions)Speaker parameters: 2 × 40 mm 4 Ω full-range speaker driversFrequency response: 65 Hz–20 kHzOutput power: 5.3 W × 2Supported sampling rates for USB DAC: 44.1 kHz/48 kHz/96 kHz, 16/24/32-bit