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Just describing as USED, because I am not a retailer.Brand New!Sealed Box !!Not a retailer, NO returns!!!A unique, pocket-sized portable DAC and headphone amplifier featuring a MagSafe-compatible magnetic rear and dual USB-C ports for pass-through charging. It uses an ES9039Q2M DAC chip paired with ES603Q amps to deliver clean, transparent, uncolored sound with no internal batteryKey Features and DesignMagSafe Mount: Sticks securely to the back of magnetic phone cases via an N52 magnetic hold, preventing dangling cables.Dual USB-C: Supports simultaneous phone charging and audio listening via charge pass-through.Outputs: Includes standard 3.5mm single-ended (80mW at 32Ω) and 4.4mm balanced (180mW at 32Ω) headphone jacks.Display & Extras: Features a round color LCD screen showing volume meters, settings, and custom uploaded images or mini-games accessed via the "Vista" button.Audio Specs: Decodes up to 32-bit/384kHz PCM and native DSD256. Pros: Clean and neutral audio presentation, low noise floor for sensitive IEMs, highly convenient magnetic mobile form factor, and fun display customization.
US$135 is a bit above the median used price of US$70 and sits just over the 75th percentile of US$121, so this reads as ambitious rather than a bargain. It’s not wildly off for a current model with a list price around US$149.99, but it’s close enough to new-retail territory that the used discount feels thin.
The upside is that this is a well-liked portable DAC/amp with a clean, neutral presentation, dual USB-C convenience, 3.5 mm and 4.4 mm outputs, and enough power for most efficient headphones and IEMs. If it’s complete and lightly used, it’s a capable, modern little unit; the buyer-friendly angle here is only if you specifically want the magnetic phone-friendly design and included accessories, because otherwise I’d want a stronger break from new price.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Fosi Audio emerged in January 2017 from a modest 10-square-meter office in Shenzhen, China, founded by Ryan Huang and a partner driven by the conviction that high-fidelity sound should be accessible without elite pricing. The brand represents the new wave of Chinese audio manufacturers challenging the traditionally expensive import-dominated hi-fi market. In less than a decade, the company has grown from a confidential startup to an internationally recognized player, now operating from an R&D center spanning over 2,300 square meters and holding more than 100 patents.
Fosi Audio's product portfolio spans the full spectrum of hi-fi components, with particular strength in compact amplifiers and digital-to-analog converters that deliver disproportionate performance for their price point. The brand manufactures integrated and multi-channel amplifiers, DACs, headphone amplifiers, preamplifiers including phono stages, passive subwoofer modules, speakers, headphones, and cables. This comprehensive range reflects a deliberate strategy to serve both entry-level enthusiasts and experienced audiophiles seeking value-oriented solutions rather than feature-laden complexity.
The brand occupies a distinctly mid-tier, value-conscious position in the market, distributed across more than 150 countries and frequently ranking atop Amazon's hi-fi charts. Fosi's reputation rests on pragmatic engineering—delivering compelling sound quality through efficient, optimized electronics rather than pursuing systematic upscaling. The company sells directly through its website, Amazon, and AliExpress, backing products with lifetime technical support and a 24-month warranty, positioning itself as an accessible gateway into serious hi-fi rather than a luxury or boutique concern.
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