●Product 1: Focus on the music: XREF20 is the optimal way to try the Reference 4 speaker calibration. Included is a 21-day free test phase of the Reference 4 Studio Edition. ●Product 1: No more worries: calibrate your room properly on sound and focus on the music. You will no longer have to worry about your equipment ●PRODUCT 1: CUSTOM CALIBRATION PROFILE - Each microphone has been measured by Sonarworks acoustics against an ANSI certified measuring microphone. This means perfect accuracy within the audible range ●Product 1: Perfect accessories: the calibration microphone is the perfect add-on to your personal recording studio and must not be missing! Measure yourself and see the difference for yourself. ●Product 2: USB audio interface, 2 in / 2 out UCA202 by Behringer ●Product 2: Manufacturer part number: UCA202 ●Product 2: Manufacturer name: Behringer