Built-in high-capacity battery Supports over-voltage protection during charging Compatible with headphones having impedance from 16 Ω to 600 Ω Features adjustable output volume and bass control Equipped with one 3.5 mm headphone output port and one 3.5 mm line input port Charging via USB-C port Constructed from aluminum alloy for premium texture and durability This is a portable Hi-Fi headphone amplifier with built-in rechargeable battery, designed to enhance headphone volume and sound quality. Connect it to your PC, smartphone, or gaming console using a standard 3.5 mm audio cable. Input port: 3.5 mm (TRS) Headphone output port: 3.5 mm (TRS) Charging port: USB-C Built-in battery: 3.7 V / 1400 mAh Charging input: 5 V / 500 mA Standby power consumption: 12 mA Maximum operating current: 55 mA Battery life: ≥24 hours Output power: – 16 Ω headphones: 48 mW – 32 Ω headphones: 62 mW – 150 Ω headphones: 30 mW – 300 Ω headphones: 18 mW – 600 Ω headphones: 10 mW Maximum output voltage: 8.2 Vp-p Total harmonic distortion + noise: 0.02% Signal-to-noise ratio: 100 dB Frequency response: 20 Hz – 20 kHz Channel balance: ±0.3 dB Operating temperature range: –20 °C to +60 °C Color: Black Material: Aluminum alloy Package includes: – 1 × Hi-Fi headphone amplifier – 1 × 3.5 mm audio cable – 1 × USB-C charging cable Note: Color may vary slightly due to screen settings and lighting conditions. Dimensions are subject to a tolerance of ±1–3 cm.