Xduoo XP-1 WM8740 High Performance USB DAC Portable Headphone Amplifier

Features: XP-1 is the first direct digital audio data transfer from Android 4.0 or above cellphone; also, it can be used USB DAC for PC without having to drive. DAC uses two parallel WM8740It built-in a OP+BUF architecture, high-slew-rate, OCL (output capacitor-less) with Split power supply. The device improves the sound quality immediately, and let you own Hi-Fi mobile phoneBass boost ON/OFF Switch Adopts the professional DAC chip WM8740 x 2 Rechargeable li-polymer battery with integrated charging system Use aluminum-shielded case to prevent external interference noise One 2-Setting Gain Switch to set GAIN according to the headphones Direct digital audio data transfer from Android 4.0 or above cellphone With PC audio decoding function, using high-performance PCM2706 chip, provides I2S interface for decoding, supports up to 16bit/48KHz digital signal Built-in a OP+BUF architecture, OCL(output capacitor-less) with Split power supply, ultra-low distortion, low noise, high-slew-rate for analog signal Specifications: Power Source: DC 4.2V built-in li-polymer rechargeable battery Output Power: 150mW(32Ω load) Frequency Range: Audio In:10Hz~100KHz(±0.5dB) USB In: 20Hz~20KHz(±0.5dB) Gain: +3/+7dB Bass Boost ON: +4dB (low GAIN), +11 dB (high GAIN) THD+N: 0.001% (1KHz) S/N: 110dB Suitable: Earphone Impedance: 8Ω?300Ω Playback Time: >20H (DAC input), >30H (AUX input) Charge Time: