Recording Times=CVR-120: 120 minutes, CVR-30B: 30 minutes, Voice Stored in Solid-State Flash Memory, Seven Recorded Channels - 3 crew microphones, 1 area microphone, Helicopter rotor speed, GMT or FSK, Datalink. ARINC 757/557 Compatible. Control Unit Options.  Maintenance on Condition Yields Lower Cost of Ownership.  No requirement for periodic maintenance (excluding ULB), 30,000-hour MTBF.