Introducing the Citronic CSD compact mixer This compact format audio mixer is available with either 2 or 4 mono input channels, and each mono channel has a combo XLR/jack input with individually switchable mic/instrument impedance and +48V phantom power for the XLR. These CSD mixers feature a stereo line input, as well an internal player/recorder with a backlit display that can accept a USB memory stick containing compressed audio files in various formats. Alternatively, they can connect to a smart phone via BT wireless link, giving gigging and travelling musicians the freedom to reliably create music wherever they go. Input channels have High/Low EQ and Pan controls, and mono channels also have Effects level to vary the amount of internal digital delay effect added for vocals or instruments. Output is delivered on a pair of balanced XLR connectors and offers very low noise operation for high quality studio or live performances. What's in the box? CSM series compact mixer 5Vdc power adaptor More useful information Instruction manual