1: USB flash drive support standard lossless WAV, FLAC, APE, MP3 decoding and playback, maximum support 44.1K/16bit/1411.2kbps standard lossless format (recommended WAV standard lossless format files) 2: stable and reliable performance, not only supports Bluetooth connectivity, also supports U disk copy lossless song decoding, more support for computer USB input decoder, CD player coaxial fibre optic decoding, M5 using for Philips TDA1305T dual-decoding chip, the sound quality is clear and transparent and full, no digital taste! 3: faster and more stable connection, simply open the mobile phone Bluetooth search for M5 devices, click on the pairing, the connection is successfully saved in the phone, the next time the pairing does not need to manually connect again (the phone will automatically search for Bluetooth devices that have already been paired to automatically back to the connection) 4: First copy the lossless songs from your computer or mobile phone to a USB flash drive or SD card, then insert the USB flash drive or SD card with a card reader to play it (Warm tips: the file name of the downloaded file should be WAV, FLAC, APE, MP3, encrypted files can not be played!) 5: Power on that is open, automatically back to connect the phone Bluetooth, audiophile's favourite! Type-C power supply, use 5V2A adapter power supply, you can also use mobile phone charger for power supply. Adopt encoder multi-level volume adjustment, can solve the traditional potentiometer caused by the left and right channel bias, crosstalk, murmur interference and other problems, greatly improving the stereo sense and fidelity of music. Adopt aluminium alloy shell, superb anodic oxidation + PC lens process low-key simple shape, durable and durable. Colour:As Shown Material:aluminum alloy Package Contents: 1 * Lossless Digital Audio Decoder 1 * USB cable 1 * remote control 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.