The Yamaha 8-Student Expansion kit for the the LC3 Music Lab System includes everything needed to add 8 more students to your classroom configuration. Included are 8 CM500 headset microphones, 8 lab connector cables, 8 instrument cables, and 8 instrument boxes. Use the expansion kit with your Yamaha LC3 lab system to expand your lesson plan for up to 8 more students. If you order 3 Yamaha expansion kits, you can work with up to a total of 48 students simultaneiously with the LC3.