USB External Sound Card ES9018K2M OPA1612AID Op Amp DAC Decoding Headphone Amplifier Portable DAC Ear Decoder Four-layer PCB board, low impedance, good conductivity, and improved sound quality. OPA1642: High-performance, JFET input audio operational amplifier. Active crystal oscillator, low noise base, high precision, high frequency and high stability. Note: It does not support microphones. The current of this product is relatively large. The compatibility and OTG output power of each mobile phone are different. It is not guaranteed that the mobile phone can be used. It is not a reason for return if the mobile phone cannot be used. Thank you! Suggestion: If you must use it on a mobile phone, please use a USB powered OTG cable and an external power supply to power the decoder. Thank you! Color: Black Material: Aluminum Alloy Package Contents: 1 * USB DAC HiFi Sound Card