(1)With 6 kinds of audio input (Bluetooth 5.0 / USB & U-disk / stereo / AUX / SD card / FM radio) and 2 kinds of audio output (stereo / 3.5mm headphone jack), compatible with different audio devices and such as phone, computer, CD player, and so on. (2)Can be used as a Bluetooth or USB , a preamp, a headphone amp and a FM radio, but also as a digital music player, supporting lossless format such as APE, FLAC, WAV, MP3, WMA, DTS etc, providing HiFi listening experience. (3)Op amp circuit adopting NE5532 chip, with strong drive power, better sound quality and warm sound listening. Noise reduction circuit is specially designed to upgrade the sound and make no background noise. (4)Mini size and simple design but with powerful function, blue digital display looks more attractive, equipped with remote control, very convenient to use. Powered by micro-USB, it can be used in the car, bringing listening pleasure during the journey. Audio Input: Bluetooth, USB, SD card, AUX, stereo , FM radio Audio output: stereo , 3.5mm headphone jack U-disk/SD card supported format: APE, FLAC, WAV, MP3, WMA, DTS Working voltage: DC 5V FM band: 87.5-108MHz Power interface: Micro-usb Chassis material: aluminum alloy Dimensions(WxLxH): 92x108x38mm / 3.62x4.25x1.49inch Net weight: 256g / 0.56lb Package weight: 410g / 0.90lb Colour:Black Material:Metal+Plastic Due to different product batches, the appearance , which does not affect the use Package Contents: 1 x Audio Player 1 x Remote Control(without 2x AAA batteries) 1 x Bluetooth Atenna 1 x FM Antenna 1 x USB Cable 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.