Small USB headphone amplifier with optimized HiFi audio architecture ensures high-resolution sound quality. The portable USB DS1 compatible with various systems like Android/iOS//, compatible with the latest devices: phones/computers/tablets/laptops/audio players, etc. Wonderfully versatile when commuting in the home, office, or gaming. DS1 adopts Technology ES9038Q2M Chips supporting DSD 512 and 32Bit/768kHz PCM, features best-in-class specifications and high-power outputs capable of supporting the most demanding of headphones with impedance above 200Ω. Low Noise Floor Clean Sound for True High-Fidelity. DS1 features abundant power with a high signal-to-noise ratio, low distortion, and almost 0 noise. 3.5MM+4.4MM Dual Headphone Outputs both Powerful to easily drive most headphones. The traditional 3.5mm single-ended headphone output is widely compatible with most headphones, and a 4.4mm balanced headphone output for a more detailed audio experience. +N120dB, Noise Less than 1.6UV. Frequency response: 20Hz-20kHz (±0.5dB) +N: SE: 0.0006%(32Ω); : 0.001%(32Ω); S: ≥120 dB Output Power : SE: 120MW /32Ω, : 220MW /32Ω Recommended headphone impedance: 16-300Ω(SE); 16-300Ω() Dual headphone outputs: 3.5mm single-ended and 4.4mm balanced headphone jack; Color: Black Material: Zinc alloy Package Contents: 1 * Headphone amplifier 1 * Type-C to Type-C cable 1 * USB-A to USB-B adapter 1 * English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.