This PA-89H/A20 adapter converts a Bose A20 Panel Mount headset to a single U-174/U plug for helicopter use. Product Weight: 2.3 ounces Shipping Weight: 0.50 pounds At Pilot Communications USA, their commitment is to the customer. Their goal is to exceed your expectations in the way their products are designed, perform, and are serviced. Even under the most demanding situations, the way their products perform and the way you’re taken care of as a customer are paramount to their business. Several of their staff are pilots and their company has 30 years of experience in aviation and communications.