The Topping DX3 Pro+ DAC & Headphone Amplifier is compact but highly multifaceted ready for digital optical & coaxial USB (Universal Serial Bus) & high resolution wireless connections. Thanks to NFCA circuitry the ES9038Q2M D/A chip achieves ultra-low distortion with THD+N as low as 0.00015% meaning you can enjoy an authentic audio experience without unwanted noise being picked up by sensitive headphones. Alternatively the DX3 Pro+ can also be as a discrete preamplifier expertly converting your music for dynamic stereo listening.