Features & description: Plug A: 1B 7 pin  female;Plug B: 1B 10 Pin male B&K cable replace AO-0645.fit for old style Preamp Type 2669C to Analyzer Type 2270 Microphone cable is good use for connects classical microphone preamplifiers to sound level meter and other inputs (for example, Bruel & Kjaer Types 2250, 2270 and 3639) Length:2M/3M/5M/10M(any other length you need ,you can message us.we can customize)