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What the manufacturer says:

"Native Instruments Traktor Kontrol S2 delivers a 2.1 Channel DJ System built from the same technology as used on Trakor Kontrol S4. Native Instruments Traktor Kontrol S2 features everything the modern DJ needs, from flagship DJ software, advanced DJ controllers, iPod integration and an inbuilt USB Audio Interface housed in a compact and easy format. Traktor Kontrol S2 comes with serious professional credentials.

"Compared with other DJ controllers, NI Traktor Kontrol S2 features an innovative 2.1 design that offers an additional channel to mix in Traktor's Sample Decks. Traktor Kontrol S2 also ships with NI's flagship DJ software and is the only controller of its size bundled with a full version of Traktor Pro 2."

Native Instruments Traktor Kontrol S2 for £329 from Hard To Find - Free UK delivery