The Pilot USA PA-87H high to low impedance converter is specially designed to smooth the transition between helicopters and military aircrafts. This product allows a high impedance helicopter headset to perform in a low impedance military aircraft. Use the PA-87H on your helicopter headset that features a U174/U single plug or equivalent. Instead of wasting hundreds of dollars on a new headset, adapt your current helicopter device to your military aircraft. This affordable alternative is incredibly simple and straightforward, delivering clear communications and hassle-free use to your aircraft. Many specialized headsets can cost nearly $1,000. This high to low impedance converter is priced at a fraction of the cost of a new headset. Convert your helicopter headset to military specifications with our no-maintenance, zero-assembly adapter cable. Use the same headset in your helicopter and military aircraft without confusing cables and faulty connections with the PA-87H, guaranteed to impress any aviator.