Fosi Audio SK01 Headphone Tone Loudness Portable Class A Analog Amplifier for Electric Japanese Instruction Manual Included Amplifier, Equalizer,

------------------------------------------------------------------------------------------------------------------ 【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction.

【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary.

【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product.

【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer. ------------------------------------------------------------------------------------------------------------------

Combo Design: As a powerful headphone amplifier, customizable analog preamp, or acoustic equalizer for instruments, it delivers superior sound quality and personalized sound signature, easily enhancing your hearing experience. Tri-Band Control: Allows adjustment of high, mid and low frequencies, combined with a center detent for attenuation, making it easy to achieve the ideal balance. Up to 2400mW of power is available in high-impedance mode. Versatile features: Instantly restore original sound with one click of the tone disable button. Use the loudness function to immerse yourself in music during quiet moments. Use the gain level switch to adjust the gain level to accommodate headphones with different impedances. Excellent Design and Craftsmanship: The aluminum alloy body is crafted with meticulous attention to detail. Its built-in 2500mAh battery provides up to 6 hours of battery life. It offers versatile connectivity via 3.5mm and 6.35mm headphone jacks (32-300 ohms), functioning as both a portable and desktop headphone amplifier. Package contents: 1x Fosi Audio SK01 Headphone Amplifier, 1x User Manual, 1x 2-in-1 USB Type-A/C to Type-C Cable, 24-month warranty and responsive customer service. Note: ① If you experience noise while charging, we recommend moving the headphone amplifier away from other wireless devices and using a high-quality shielded cable and power adapter. ② If you feel the volume is insufficient, it may be because the headphone impedance is too high. We recommend connecting headphones with appropriate impedance (e.g., 16-300 Ω). If the headphone impedance is too high, you may need to use high-gain mode. ③ If you suddenly lose sound, make sure all interfaces are properly connected and that the volume settings on the audio source and SK01 headphone amplifier are not set to minimum. ④ If the treble boost is weak, it may be because it is set to low-gain mode. We recommend switching to high-gain mode. Pressing the TONE button may also disable high, mid, and low adjustments. Make sure the TONE setting is enabled and adjust the treble and bass as needed. We also recommend using a high-quality audio source and headphones. I will. The combination of treble, mid, and bass adjustments and center point position makes it easy to find the perfect balance. Plus, all tone adjustments can be easily disabled with a click of the PURE button. Input: 3.5mm Line In Output: 3.5mm Line Out, 3.5mm/6.35mm Headphone Jack Maximum Output: RMS 2400mW@32Ω Termination Impedance: 16-300Ω