Abstract: A connective assembly for selectively interfacing a single listening device with a two-way radio and a cellular device enables selective listening therebetween from a single listening device, such as an earpiece, a throat microphone, and a prior art microphone. The assembly provides both a half-duplex and a full-duplex system that creates communication in both directions, including simultaneous connections. At least one assembly switch enables powering on and off of the assembly, and selective interfacing between the two-way radio and the cellular device. A push-to-talk button enables enable half-duplex two-way communications. A send button enables full-duplex two-way communications. A finger switch enables selective interfacing between the two-way radio and the cellular device. A full-duplex switch enables simultaneous communication between the two-way radio and the cellular phone. A clip mounts the listening device to the garment.