【Dual ES9219C DAC】The UP4 2022 is equipped with two deeply developed ES9219C chips as the core DAC. The heat generation is stably controlled while the power consumption is low. The resolution and restoration power are convincing, and the strong output power presents excellent warm sound quality. 【Bluetooth 5.0 Headphone Amplifier】Qualcomm CSR8675 Bluetooth chip, UP4 2022 adopts Bluetooth 5.0 version, supports LDAC / LHDC/ aptX HD / aptXLL / aptX / AAC / SBC full-format Bluetooth encoding protocol, provides stable and smooth Bluetooth transmission, and bid farewell to delay. The corresponding lights are different under different protocols, and you can enjoy a free and intelligent experience. 【2.5mm Balanced + 3.5mm Single-ended Output】The UP4 2022 is equipped with a 2.5 + 3.5mm dual interface. In the balanced output mode, the dual ES9219C DAC burst out synchronously, and the left and right separation, sound field performance, and signal output are getting better and better. 【Long battery life】UP4 2022 is equipped with a large 540mAh battery, charging for 2 hours, listening for a whole day about 300 hours long standby, single ended is 11.5H, balance is 9.5H, guarding your HiFi journey. 【More function】HD calling; High-gain, low-gain, dual DAC booster switch freely; NFC function; APP Control; UP4 2022 is equipped with mainstream Type-C USB interface, supports USB DAC, mobile phone, computer, tablet, TV, car audio and other equipment, easy to connect.