For QCC3084 Bluetooth 5.4 chip Supports LDAC/AptxHD protocols, 24bit/96kHz bitrate transmission Enthusiast's computer USB professional decoder Italian Amanero Combo module digital interface, DSD512 hardware decoding, PCM 384kHz/32Bit LDAC/AptxHD lossless protocol transmission U disk play Supports up to 512 folders and can store and play up to 99,999 music files.USB flash drives or external hard drives must be formatted as EXFAT or FAT32, and support is available up to 2TB TFT full color display Intuitive display and clear operation Input status, signal format, volume level, playback status, file information Dynamic range: equal 121dB Harmonic distortion ():less than equal 0.0005% Frequency response: 20Hz-20kHz (±0.06dB) output level: 2Vrms Recommended headphone impedance for this phone: 16-350 ohms Input voltage: DC12V/1A (The product printed words depending on the batch, but this does not affect use) Type:No USB Color:As Shown Material:Aluminum Alloy Package Contents: 1 * HIFI Earphone Amplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.