Characteristics With 3 types of audio inputs (Bluetooth/USB/RCA) and 2 types of outputs (RCA/3.5mm headphone), the P1 can be used as a HiFi tube preamp, USB DAC or headphone amplifier with a clear, warm, dynamic and sweet HiFi tube sound, providing an extremely high-quality listening experience. Bluetooth 5.0 (QCC3008) supports APT-X, APT-X LL lossless transmission. PC-USB (CM6642) supports 24bit 192KHz and is compatible with Windows/Mac/Linux systems, fits well with many audio devices such as iPod, phone, MP3 player, TV, Blu-ray player, Echo Dot, CD player, etc. Adopting 2PCS NE5532 classic 47 headphone amplifier architecture, which can drive 32-300 ohm headphone, and a bypass switch is specially designed to turn the tone control on/off, more convenient to enjoy original sound or get more delicate sound with treble and bass controls, add much fun and higher playability. Exquisite appearance with reasonable size, blue and orange light decorate vacuum tube, makes it fashionable and attractive, bring wonderful auditory and visual enjoyment, very suitable for home and desktop audio system. parameter Chip architecture: CM6642+QCC3008+NE5532+classic 47