About this item * High-Fidelity Amplification - 0.0003% THD+N*--: This portable low distortion audio headphone amp is engineered with a dual-voltage (±4V) circuit delivering pristine audio reproduction across 16-150 impedance ranges. Achieves >100dB SNR and ultra-low distortion for uncolored monitoring accuracy. * Extended Operation - 1000mAh Lithium Power*--: This rechargeable headphone amplifier provides 8+ hours continuous playback at 30mW output into 150 loads. Intelligent power management maintains consistent voltage regulation throughout discharge cycle. * Impedance-Optimized Two-stage Gain Switch*--: This variable gain headphone amp features selectable gain settings (low/high) to ensure proper load matching: Low: 16-32 (IEMs/earbuds) and High: 50-150 (monitoring headphones), precision-matched to transducer requirements. * Aerospace-Grade Aluminum Materials*--: This durable headphone amplifier is made of a 6061 aluminum enclosure, providing RF/EMI shielding (-40dB interference re