C6717/X Waterproof microphone extension cable for CEL-400 Series

/X represents length of cable in meters available as
15ft (5m), 30ft (10m), 60ft (30m) or 150ft (50m) standard lengths
maximum length 500ft (150m) to special order

Note - this cable is normally used when CEL-400 SLM is fitted in CEL-6723 Weatherproof case