MXL 550/551 w PreSonus AudioBox USB Interface, Headphones, & XLR Cables Bundle Specially Priced Package includes MXL 550 / 551 with all items as packaged by MXL, PLUS: (1) PreSonus AudioBox USB 2-channel USB Audio / MIDI interface to record with (1) Pair of Superlux HD661 Black closed-back stereo headphones to monitor takes while recording (2) 20 ft. Balanced XLR microphone cables to connect the microphones to the US-322 Sonic Sense One-Year Extended Warranty Adds One Year to Manufacturer's Warranty