QA350 Hi-Fi Player (have DAC&HeadPhone Amp)not

QA350 Hi-Fi Player (have DAC&HeadPhone Amp)not need USB QA350 is a WAV high fidelity music player designed and made by QLS Electronics. SD card is applied as storage medium while lossless WAV format as the sound source. The player integrates DAC and headphone Amplifier circuit with the built-in high-capacity rechargeable lithium polymer battery. It is convenient to carry with and play music. QA350 retains the optical and coaxial digital output of QA-550, while increases the analog (LINE OUT) output (which can be directly connected to your amplifier or pre-level) and the amp output, which can drive the majority of 16-300Ω headsets. Product specifications Indicators: Play format: 16bit 44.1K WAV (the same with CD ripping and file format). Storage method: SD card storage media is applied for audio playback, FAT32 format less than (equal to) 16G, SD/SDHC), SD card support hot swap. Support maximum 55 folders with the maximum of 550 songs; the remote control can directly select the folder or directly input the track number. The operation is very convenient. Digital output chip: CS8406. DAC Chip: Wolfson WM8740. LVP: AD8656. Headphone Amp chip: MAX9722A. Digital Output: Coaxial (RCA), Fiber Optical (round). Analog Output: LINE OUT, headphone AMP output. LINE OUT parameters: level 2V (RMS); frequency response 20hz-20Khz. SNR> 100dB; Distortion <0.005%. Headphone amp out parameters: 130mW/32ohm.70mW/16ohm. Frequency response: 20 Hz-20Khz. THD + N (total harmonic distortion plus noise): 0.009%. Headphone output matching impedance: 16 ohm --- 300 ohm Battery Type: 7.4V Li-Po battery of Model General Specifications, maximum size: 55mm * 31mm * 16mm; the capacity is usually among 800-1100mAH. Battery life: 6 to 8 hours. Charging time: 1.5-3 hours (when charging, playing music can available powered by the external power supply) Power consumption: 120mA-150mA (LCD backlight does not open) or 150-180mA (open LCD backlight) Specifications of matching charger: Support 2 cells Li-Po batterys balance charger. Supply Voltage: 110-240V AC. Maximum charge current: 800mA. Display: double-color LED instructions of charging charge status. Dimension: 135mm * 78mm * 27mm (excluding the output socket, switch, button, etc.) 150mm * 78mm * 30mm (with all the sockets, VR button, switch, button) Package size: 235mm * 135mm * 55mm Single Weight (with battery): 0.3kg Packing Weight: 0.75kg