The Allen & Heath XONE:4D is a high-quality DJ mixer with 20 channels and a range of input/output ports including analog RCA/coaxial, USB, XLR, and 6.35 mm TRS/TS. This mixer is perfect for PC/Mac compatibility and includes features such as BPM counter, tempo control, built-in equalizer, built-in sound card, and more. The XONE:4D is also portable and rack-mountable, with LED lights and a 3-band equalizer. The XONE:4D is designed to provide a seamless mixing experience for DJs, with both analogue and digital capabilities. The mixer also includes a built-in phono preamp, EQ Kill, and send/return I/O. The XONE:4D is a versatile mixer that is perfect for any DJ looking for a high-quality mixer with a range of features.