Features & description: Preamplifier connector:  0B, 7-PIN female Connector to instrument/cable:  1B, 7-PIN male Very low inherent noise, high input impedance This microphone preamp(2669 L) cable operates preamplifier and high-impedance input probe for Brüel & Kjær measuring instruments Length:2M/3M/5M/10M(any other length you need ,you can message us.we can customize)