Fosi Audio SK01: Headphone amplifier and preamplifier with battery

Fosi Audio SK01 is a new headphone amplifier with battery. RMS output power is up to 2400mW@32Ω. It has a volume control and a tone control.
Covering all your hi-fi needs

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Can a tiny box do all this? Testing the Fosi Audio SK01 headphone amp, preamp, EQ

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Fosi Audio SK01 Headphone Amplifier & Preamplifier

Fosi Audio SK01 Headphone Amplifier Equalizer Preamp with Bass Midrange Treble Tone Control and Loudness Compensation Portable Class A Analog Amp for Electric Guitar Instrument with 3.5mm 6.35mm Jacks : Electronics

Fosi Audio SK01 Headphone Amplifier & Preamplifier 2 in 1 for Headphone Earphone, Power Amplifier, Active speakers - AliExpress

Fosi Audio SK01: Headphone amplifier and preamplifier with battery

Fosi Audio SK01 - Reviews Headphone Reviews and Discussion