Digi-Wave 400 Series Interpretation System for one presenter and 10 listeners. Includes: (1) DLT 400 transceiver, (10) DLR 400 ALK receivers, (1) MIC 144 headset microphone, (10) EAR 022 surround earphones, (10) BAT 010-2 AAA alkaline batteries, (1) CCS 06