From Rane:

A compact, professional 2-deck, galvanic insulated interface packed with creative features to give DJs a competitive edge. Boasting high quality 48 kHz, 24-bit audio, the Rane SL2 includes inputs for 2deck mixing on turntables or CD decks and two software-switchable analog Thru connections for regular vinyl or CD.

Inputs for two deck mixing on turntables or CD decks.

Two software-switchable analog Thru connections for regular vinyl or CD.

Studio-grade phono preamps, and 48 kHz 24-bit audio processing for superior sound quality.

Advanced, low latency USB 2.0 drivers.

Built-in galvanic isolation to eliminate computer noise and interference.