Specifications: DAC Chip:ES9018K2M;  USB DAC:Yes, support;  Size:139*75.2*22.8mm;  Working time:about 9 hours;  Output power:500mW;  Computer USB input:support Win7/8/10, iOS, Android system;  Battery:3.7V/4000mAh;  Function:SRC;  Support Device:PS4/PC/Switch/X-BOX;  Material:Aluminum alloy;  Optical and Coaxial Input:Yes, support;  Extend Bluetooth:5.0;  ( Connected to the O5BL Become to a Bluetooth DAC amplifier If you need to use the Bluetooth function, please order the 05BL )    Features: High Audio Performance for Game and Video.  It is compatible with desktops, laptops, tablets, or smart devices for PC/PS4/X-BOX and other gaming platforms.  Immersive Experience.  Profession digital and analog circuits create vivid surround sound effects on headphones and active loudspeaker.  HD digital audio decoding.  Smooth and subtle sound with high fidelity.  Built-in mainstream ES9018K2M DAC supports a high-resolution sampling rate of PCM.  500mW output Power.  Sufficiently Powering Headphones.  And it can effectively be driving headphones with an impedance of 16Ω-600Ω from in-ear headphones to studio headphone.  Personal Sound Enhancement System.  Flexibly compatible with headphones of different impedances.  Heavy bass and big sound stage to reproduce bursting sound.  Improve the quality of Low-bit rate music.  Through starting the hardware SRC function.  Easy to operate and understand.  Dual power supply for mobile and desktop devices.  Screen lighting, easy to notice.  The 0.91-inch OLED display clearly shows the audio sampling rate, input interface, power and DAC filter status.     Package Included:   1 x XD05 Basic Headphone Amplifier