Klein Electronics, Inc. offers the BK-Adapter for Bendix King radios. The adapter connects any headset or earpiece with Kenwood or RELM 2-pin connector to Bendix King radios. Currently, there are a limited variety of headsets for BK radios. The multi-pin connector is expensive and difficult to make. By using the BK-Adapter, hundreds of headset and earpiece options are available because it utilizes a common, low cost 2-pin Kenwood connector. This is the same connector used by RELM, which owns BK.